Pull Request resolves # .

• I read the Generative AI policy and my contribution is either not created with the help of AI or is compatible with the policy and GNU/GPL 2 or later.

Summary of Changes

When editing a module and selecting an alternative layout provided by a site template (override), the layout dropdown renders labels in en-GB instead of the admin's current language. If no translation exists, of course the filename would be displayed.

There is a bug in ModuleLayoutField::getInput() where it loads the language with with the $default = true parameter, which triggers Language::load()'s implicit en-GB preload. When an earlier field on the same form has already loaded the same language file e.g. the Position field, the current-language filename is cached. The preload merges en-GB on top of the existing current-language strings, That way, a translation provided by a the template, would not be used.

Debug Language set to "On" masks the bug because it skips the preload.

A practical / real life scenario would be, if you created a custom site template and ship that with an override for, let's say: mod_articles. This override introduces a new layout called: fancy-with-sugar-on-top.php

The corresponding language string for that layout would then be:
TPL_YOURTEMPLATE_MOD_ARTICLES_LAYOUT_FANCY-WITH-SUGAR-ON-TOP="Fancy article layout with sugar on top"

Testing Instructions

Download and install the demo template tpl_acme.zip. It has got a custom layout for mod_articles called: translateme.php. The template / style does not have to be activated.

I've included language files for en, es and de to test this with. Now, set the backend language either to Spanish or German, given you installed one of these first.

Create a new module instance of mod_articles and switch over to the Advanced Tab -> Layout. The dropdown should list all available overrides / layouts grouped by template + the default option.

Actual result BEFORE applying this Pull Request

Regardless of the selected backend language, the en-GB version of the translation is used.

Expected result AFTER applying this Pull Request

The drowdown shows the translation currently selected as the default.

Link to documentations

Please select:

• Documentation link for guide.joomla.org: n/a

• No documentation changes for guide.joomla.org needed

• Pull Request link for manual.joomla.org: n/a

• No documentation changes for manual.joomla.org needed