@brianteeman please take a look at this, I hope it fits.

The sort in my IDE places characters before _ when sorting

COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_UPDATE_SERVER_OFFERS_NO_COMPATIBLE_VERSION_NOTES
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSION_COMPATIBLE

The sort in my IDE places characters before _ when sorting

This has been discussed before.
Obviously EXENSION comes before EXTENSIONS

Here is the full correct sorting

COM_JOOMLAUPDATE_CHECKED_UPDATES="Checked for updates."
COM_JOOMLAUPDATE_CONFIG_CUSTOMURL_LABEL="Custom URL"
COM_JOOMLAUPDATE_CONFIG_SOURCES_DESC="Configure where Joomla gets its update information from."
COM_JOOMLAUPDATE_CONFIG_SOURCES_LABEL="Update Source"
COM_JOOMLAUPDATE_CONFIG_UPDATESOURCE_CUSTOM="Custom URL"
COM_JOOMLAUPDATE_CONFIG_UPDATESOURCE_CUSTOM_ERROR="The custom URL field is empty."
COM_JOOMLAUPDATE_CONFIG_UPDATESOURCE_DEFAULT="Default"
COM_JOOMLAUPDATE_CONFIG_UPDATESOURCE_LABEL="Update Channel"
COM_JOOMLAUPDATE_CONFIG_UPDATESOURCE_NEXT="Joomla Next"
COM_JOOMLAUPDATE_CONFIG_UPDATESOURCE_TESTING="Testing"
COM_JOOMLAUPDATE_CONFIGURATION="Joomla Update: Options"
COM_JOOMLAUPDATE_CONFIRM="Confirm"
COM_JOOMLAUPDATE_FAILED_TO_CHECK_UPDATES="Failed to check for updates."
COM_JOOMLAUPDATE_LOGIN="Login"
COM_JOOMLAUPDATE_MINIMUM_STABILITY_ALPHA="Alpha"
COM_JOOMLAUPDATE_MINIMUM_STABILITY_BETA="Beta"
COM_JOOMLAUPDATE_MINIMUM_STABILITY_DESC="The minimum stability of the Joomla updates you would like to see. Development is the least stable, Stable is production quality. If an update doesn't specify a level it is assumed to be Stable."
COM_JOOMLAUPDATE_MINIMUM_STABILITY_DEV="Development"
COM_JOOMLAUPDATE_MINIMUM_STABILITY_LABEL="Minimum Stability"
COM_JOOMLAUPDATE_MINIMUM_STABILITY_RC="Release Candidate"
COM_JOOMLAUPDATE_MINIMUM_STABILITY_STABLE="Stable"
COM_JOOMLAUPDATE_OVERVIEW="Joomla Update"
COM_JOOMLAUPDATE_PREUPDATE_CHECK_CAPTION="Table of server settings to check before update."
COM_JOOMLAUPDATE_PREUPDATE_CHECK_COMPLETED_YOU_HAVE_DANGEROUS_PLUGINS="There are plugins installed and enabled that could interfere with the Joomla upgrade and result in a failed upgrade that leaves the site inaccessible.<br><br>You are strongly advised to upgrade, disable or uninstall these plugins before upgrading."
COM_JOOMLAUPDATE_PREUPDATE_CHECK_EXTENSION_AUTHOR_URL="Extension Author URL"
COM_JOOMLAUPDATE_PREUPDATE_CHECK_NOT_COMPLETE="Pre-Update checks have not been completed yet - please wait."
COM_JOOMLAUPDATE_PREUPDATE_HEADING_CHECKED="Checked"
COM_JOOMLAUPDATE_PREUPDATE_HEADING_REQUIREMENT="Requirement"
COM_JOOMLAUPDATE_PREUPDATE_UNKNOWN_EXTENSION_MANIFESTCACHE_VERSION="Unknown Version"
COM_JOOMLAUPDATE_SYSTEM_CHECK="System Check"
COM_JOOMLAUPDATE_TOOLBAR_CHECK="Check for Updates"
COM_JOOMLAUPDATE_UPDATE_CHECK="Update Check"
COM_JOOMLAUPDATE_UPDATE_LOG_CLEANUP="Cleaning up after installation."
COM_JOOMLAUPDATE_UPDATE_LOG_COMPLETE="Update to version %s is complete."
COM_JOOMLAUPDATE_UPDATE_LOG_DELETE_FILES="Deleting removed files and folders."
COM_JOOMLAUPDATE_UPDATE_LOG_FILE="File %s downloaded."
COM_JOOMLAUPDATE_UPDATE_LOG_FINALISE="Finalising installation."
COM_JOOMLAUPDATE_UPDATE_LOG_INSTALL="Starting installation of new version."
COM_JOOMLAUPDATE_UPDATE_LOG_START="Update started by user %2$s (%1$s). Old version is %3$s."
COM_JOOMLAUPDATE_UPDATE_LOG_URL="Downloading update file from %s."
COM_JOOMLAUPDATE_VIEW_COMPLETE_HEADING="Joomla Version Update Status"
COM_JOOMLAUPDATE_VIEW_COMPLETE_MESSAGE="Your site has been updated. Your Joomla version is now %s."
COM_JOOMLAUPDATE_VIEW_DEFAULT_ACTUAL="Actual"
COM_JOOMLAUPDATE_VIEW_DEFAULT_COMPATIBILITY_CHECK="Joomla! %s Compatibility Check"
COM_JOOMLAUPDATE_VIEW_DEFAULT_COMPATIBLE_UPDATE_WARNING="Extensions marked with <span class='label label-warning'>X.X.X</span> have an extension update available for the current version of Joomla which is not marked as compatible with the updated version of Joomla. You should contact the extension developer for more information."
COM_JOOMLAUPDATE_VIEW_DEFAULT_DATABASE_STRUCTURE_NOTICE="Go to 'System - Maintenance - Database' and use the 'Update Structure' button."
COM_JOOMLAUPDATE_VIEW_DEFAULT_DATABASE_STRUCTURE_TITLE="Database Table Structure Up to Date"
COM_JOOMLAUPDATE_VIEW_DEFAULT_DB_NOT_SUPPORTED="Your database type is not supported"
COM_JOOMLAUPDATE_VIEW_DEFAULT_DB_NOT_SUPPORTED_DESC="An update to Joomla %1$s was found, but your current database type is not supported by the new version.<br>For further details take a look at <a href=\"https://downloads.joomla.org/technical-requirements\">the minimum requirements for Joomla %1$s</a>."
COM_JOOMLAUPDATE_VIEW_DEFAULT_DESCRIPTION_BREAK="Extensions marked with <span class='badge bg-danger'>No</span> or <span class='badge bg-secondary'>Missing Compatibility Tag</span> might break your website. Please consult with the developer before updating."
COM_JOOMLAUPDATE_VIEW_DEFAULT_DESCRIPTION_MISSING_TAG="Extensions marked with <span class='badge bg-secondary'>Missing Compatibility Tag</span> indicate the developer has not included <a href='https://docs.joomla.org/Special:MyLanguage/Deploying_an_Update_Server' target='_blank' rel='noopener noreferrer'>compatibility information.</a>"
COM_JOOMLAUPDATE_VIEW_DEFAULT_DESCRIPTION_UPDATE_REQUIRED="Extensions marked with <span class='badge bg-warning text-dark'>Yes (X.X.X)</span> might require an update."
COM_JOOMLAUPDATE_VIEW_DEFAULT_DIRECTIVE="Directive"
COM_JOOMLAUPDATE_VIEW_DEFAULT_DOWNLOAD_IN_PROGRESS="Downloading update file. Please wait ..."
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXPLANATION_AND_LINK_TO_DOCS="The pre-update check provides you with information about the readiness of your server, settings and installed extensions for the update.<br>You can find more information about this page and how to prepare for updating Joomla in the <a class='pre-update-docs' href='https://docs.joomla.org/Pre-Update_Check' target='_blank' rel='noopener noreferrer'>pre-update check documentation</a>."
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSION_COMPATIBLE="Compatible"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSION_COMPATIBLE_WITH_JOOMLA_VERSION="Joomla %s Compatible Version"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSION_INSTALLED_VERSION="Installed Version"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSION_NAME="Extension Name"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSION_NO_COMPATIBILITY_INFORMATION="No Compatibility Information"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSION_SERVER_ERROR="Update Server error"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSION_TYPE="Extension Type"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSION_VERSION_MISSING="Missing Compatibility Tag"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSION_WARNING_UNKNOWN="Unknown error"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS="Extensions Pre-Update Check"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_DESC="Table of extensions to check before update."
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_NONE="No extensions installed."
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_PRE_UPDATE_CHECKS_FAILED="Pre-Update Checks Failed"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_PRE_UPDATE_CHECKS_FAILED_NOTES="It was not possible to check the compatibility of these plugins. The request to the update server either timed out or returned an error."
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_PROBABLY_COMPATIBLE="No Update Required"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_PROBABLY_COMPATIBLE_NOTES="<p>The extension developer states that the currently installed version is compatible.</p><p id='updateyellowwarning' class='hidden'>Please note that if you see a version highlighted as <span class='label label-warning'>X.X.X</span> then the extension developer is offering a newer version of the extension for your current version of Joomla than they do for the new version of Joomla. You should check with the extension developer if this is correct before you ugprade Joomla.</p>"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_REQUIRING_UPDATES_TO_BE_COMPATIBLE="Update Required"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_REQUIRING_UPDATES_TO_BE_COMPATIBLE_NOTES="<p>Please update these extensions before updating Joomla.</p><p id='updateorangewarning' class='hidden'>Please take extra care if this updated version of the extension is not also listed as compatible with your current version of Joomla.</p>"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_RUNNING_PRE_UPDATE_CHECKS="Running Pre-Update Checks"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_RUNNING_PRE_UPDATE_CHECKS_NOTES="Please be patient whilst we run the pre-update checks on your extensions."
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_SHOW_LESS_COMPATIBILITY_INFORMATION="[ Less Detail %s ]"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_SHOW_MORE_COMPATIBILITY_INFORMATION="[ More Detail %s ]"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_UPDATE_SERVER_OFFERS_NO_COMPATIBLE_VERSION="Update Information Unavailable"
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_UPDATE_SERVER_OFFERS_NO_COMPATIBLE_VERSION_NOTES="Extension does not offer a compatible version for the selected target version of Joomla. This could mean the extension does not use the Joomla update system or the developer has not provided compatibility information for this Joomla version yet."
COM_JOOMLAUPDATE_VIEW_DEFAULT_HELP="More Information."
COM_JOOMLAUPDATE_VIEW_DEFAULT_INFOURL="Additional Information"
COM_JOOMLAUPDATE_VIEW_DEFAULT_INSTALL_SELF_UPDATE_FIRST="You must update to the latest version of the Joomla Update Component before you can update Joomla!"
COM_JOOMLAUPDATE_VIEW_DEFAULT_INSTALLAGAIN="Reinstall Joomla core files"
COM_JOOMLAUPDATE_VIEW_DEFAULT_INSTALLED="Installed Joomla version"
COM_JOOMLAUPDATE_VIEW_DEFAULT_INSTALLUPDATE="Install the Update"
COM_JOOMLAUPDATE_VIEW_DEFAULT_LATEST="Latest Joomla version"
COM_JOOMLAUPDATE_VIEW_DEFAULT_NO_DOWNLOAD_URL="We can't find a download URL"
COM_JOOMLAUPDATE_VIEW_DEFAULT_NO_DOWNLOAD_URL_DESC="An update to Joomla %1$s was found, but it wasn't possible to fetch the download URL for that update. Either the update to Joomla %1$s is not available for your stability level or there is a problem with the Joomla Update Server.<br>Please try to download the update package from <a href=\"https://downloads.joomla.org/latest\">the official Joomla download page</a> and use the Upload and Update tab."
COM_JOOMLAUPDATE_VIEW_DEFAULT_NO_LIVE_UPDATE="Live Update is not available"
COM_JOOMLAUPDATE_VIEW_DEFAULT_NO_LIVE_UPDATE_DESC="There is a new version of the Joomla Update Component that needs to be installed first. <a class=\"alert-link\" href=\"index.php?option=com_installer&view=update\">Click here to update the component</a>."
COM_JOOMLAUPDATE_VIEW_DEFAULT_NON_CORE_PLUGIN_BEING_CHECKED="The system is currently checking these plugins to see if they could cause problems during the upgrade.<br><br>Please be patient while the checks are completed."
COM_JOOMLAUPDATE_VIEW_DEFAULT_NON_CORE_PLUGIN_CONFIRMATION="Do you wish to ignore the warnings about potentially incompatible plugins and to proceed with the upgrade?"
COM_JOOMLAUPDATE_VIEW_DEFAULT_NOUPDATES="No updates available"
COM_JOOMLAUPDATE_VIEW_DEFAULT_NOUPDATESNOTICE="You already have the latest Joomla version, %s."
COM_JOOMLAUPDATE_VIEW_DEFAULT_PACKAGE="Update package URL"
COM_JOOMLAUPDATE_VIEW_DEFAULT_PACKAGE_REINSTALL="Reinstall package URL"
COM_JOOMLAUPDATE_VIEW_DEFAULT_PHP_VERSION_NOT_SUPPORTED="Your PHP version is not supported"
COM_JOOMLAUPDATE_VIEW_DEFAULT_PHP_VERSION_NOT_SUPPORTED_DESC="An update to Joomla %1$s was found, but your currently installed PHP version does not match <a href=\"https://downloads.joomla.org/technical-requirements\">the minimum requirements for Joomla %1$s</a>."
COM_JOOMLAUPDATE_VIEW_DEFAULT_POTENTIALLY_DANGEROUS_PLUGIN="Potentially Serious Problem."
COM_JOOMLAUPDATE_VIEW_DEFAULT_POTENTIALLY_DANGEROUS_PLUGIN_CONFIRM_MESSAGE="Are you sure you want to ignore the warnings about potentially incompatible plugins and proceed with the upgrade?"
COM_JOOMLAUPDATE_VIEW_DEFAULT_POTENTIALLY_DANGEROUS_PLUGIN_DESC="This extension includes a plugin that could cause the upgrade to fail.<br><br>To perform the Joomla upgrade safely you should either upgrade this extension to a version compatible with your target version of Joomla or disable the relevant plugin(s) and check again.<br><br>For more information about the relevant plugins please check the 'Live Update' tab."
COM_JOOMLAUPDATE_VIEW_DEFAULT_POTENTIALLY_DANGEROUS_PLUGIN_LIST="The following plugins could cause problems during the upgrade"
COM_JOOMLAUPDATE_VIEW_DEFAULT_PREUPDATE_CHECK="Pre-Update Check for Joomla %s"
COM_JOOMLAUPDATE_VIEW_DEFAULT_RECOMMENDED="Recommended"
COM_JOOMLAUPDATE_VIEW_DEFAULT_RECOMMENDED_SETTINGS_DESC="These settings are recommended for PHP in order to ensure full compatibility with Joomla. However, Joomla! will still operate if your settings do not quite match the recommended configuration."
COM_JOOMLAUPDATE_VIEW_DEFAULT_RECOMMENDED_SETTINGS_PASSED="Recommended PHP Settings : Passed"
COM_JOOMLAUPDATE_VIEW_DEFAULT_RECOMMENDED_SETTINGS_WARNING="Recommended PHP Settings : Warning"
COM_JOOMLAUPDATE_VIEW_DEFAULT_REQUIRED_SETTINGS_PASSED="Required PHP & Database Settings : Passed"
COM_JOOMLAUPDATE_VIEW_DEFAULT_REQUIRED_SETTINGS_WARNING="Required PHP & Database Settings : Warning"
COM_JOOMLAUPDATE_VIEW_DEFAULT_TAB_ONLINE="Live Update"
COM_JOOMLAUPDATE_VIEW_DEFAULT_TAB_PRE_UPDATE_CHECK="Pre-Update Check"
COM_JOOMLAUPDATE_VIEW_DEFAULT_TAB_UPLOAD="Upload & Update"
COM_JOOMLAUPDATE_VIEW_DEFAULT_UPDATE_NOTICE="Before you update Joomla, ensure that the installed extensions are available for the new Joomla version. <br>You are strongly advised to make a <strong>backup</strong> of your installation before you start updating."
COM_JOOMLAUPDATE_VIEW_DEFAULT_UPDATEFOUND="A Joomla update was found."
COM_JOOMLAUPDATE_VIEW_DEFAULT_UPDATES_INFO_CUSTOM="You are on the &quot;%s&quot; update channel. This is not an official Joomla update channel."
COM_JOOMLAUPDATE_VIEW_DEFAULT_UPDATES_INFO_DEFAULT="You are on the &quot;%s&quot; update channel. Through this channel you'll receive notifications for all updates of the current Joomla release (4.x)"
COM_JOOMLAUPDATE_VIEW_DEFAULT_UPDATES_INFO_NEXT="You are on the &quot;%s&quot; update channel. Through this channel you'll receive notifications for all updates of the current Joomla release (4.x) and you will also be notified when the future major release (5.x) will be available. Before upgrading to 5.x you'll need to assess its compatibility with your environment."
COM_JOOMLAUPDATE_VIEW_DEFAULT_UPDATES_INFO_TESTING="You are on the &quot;%s&quot; update channel. This channel is designed for testing new releases and fixes in Joomla.<br>It is only intended for JBS (Joomla Bug Squad&trade;) members and others within the Joomla community who are testing. Do not use this setting on a production site."
COM_JOOMLAUPDATE_VIEW_DEFAULT_UPLOAD_INTRO="You can use this feature to update Joomla if your server is behind a firewall or otherwise unable to contact the update servers. First download the Joomla <em>Upgrade Package</em> in ZIP format from <a class='alert-link' href='%s' target='_blank' rel='noopener noreferrer'>the official Joomla download page</a>. Then use the fields below to upload and install it."
COM_JOOMLAUPDATE_VIEW_UPDATE_BYTESEXTRACTED="Bytes extracted"
COM_JOOMLAUPDATE_VIEW_UPDATE_BYTESREAD="Bytes read"
COM_JOOMLAUPDATE_VIEW_UPDATE_CHECKSUM_WRONG="File Checksum Failed"
COM_JOOMLAUPDATE_VIEW_UPDATE_DOWNLOADFAILED="Download of update package failed."
COM_JOOMLAUPDATE_VIEW_UPDATE_FILESEXTRACTED="Files extracted"
COM_JOOMLAUPDATE_VIEW_UPDATE_FINALISE_CONFIRM_AND_CONTINUE="Confirm & Continue"
COM_JOOMLAUPDATE_VIEW_UPDATE_FINALISE_HEAD="Joomla Update is finishing and cleaning up"
COM_JOOMLAUPDATE_VIEW_UPDATE_FINALISE_HEAD_DESC="To complete the update Process please confirm your identity by re-entering the login information for your site &quot;%s&quot; below."
COM_JOOMLAUPDATE_VIEW_UPDATE_INPROGRESS="Updating your Joomla files. Please wait ..."
COM_JOOMLAUPDATE_VIEW_UPDATE_PERCENT="Percent complete"
COM_JOOMLAUPDATE_VIEW_UPLOAD_CAPTIVE_INTRO_BODY="Make sure that the update file you have uploaded comes from the official Joomla download page. Afterwards, please confirm that you want to install it by re-entering the login information for your site &quot;%s&quot; below."
COM_JOOMLAUPDATE_VIEW_UPLOAD_CAPTIVE_INTRO_HEAD="Are you sure you want to install the file you uploaded?"
COM_JOOMLAUPDATE_VIEW_UPLOAD_PACKAGE_FILE="Joomla package file"
COM_JOOMLAUPDATE_XML_DESCRIPTION="Updates Joomla to the latest version with one click."

an underscore is after letters in the ascii table
a dash is before letters in the ascii table

There no dashes here. Just underscores.

That was just for explanation.

The point is that sorting by ascii, unicode, html character all places the underscore after the letter

COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSIONS_UPDATE_SERVER_OFFERS_NO_COMPATIBLE_VERSION_NOTES
COM_JOOMLAUPDATE_VIEW_DEFAULT_EXTENSION_COMPATIBLE

https://en.wikipedia.org/wiki/Help:Alphabetical_order#:~:text=The%20alphabetical%20order%20used%20by,and%20before%20lower%20case%20letters.

OK, what can I do to complete the PR?

@tecpromotion
Make sure you have the strings in the order I gave above (for the part above ;Copy of INSTL constants), as even Richard suggestions are not enough.

@tecpromotion
I made a PR to your branch
tecpromotion#1

I have tested this item ✅ successfully on 29fe1d2

I have tested this item ✅ successfully on 29fe1d2

RTC

Thanks!