Easy to correct. Will do. Let's the other RTL PR merged first

Code to correct is

dd {

    margin-bottom: .5rem;
    margin-right: 0; // instead of margin-left

}

Best to check/correct all the ****-left etc all in one go

Something like that as Example:

url: http://wohlkoenig-4.joomla.com/index.php/fa/component/users/reset?Itemid=101 Please click on blue Button to get Error-Notice.

It is right impossible to correct all in one go without knowing specific issues.
Regrouping all these issues in one would be helpful (with screenshots)
EDIT: with also specific urls to see the issue.
Then I can work on it.

So use this issue to record them all - and if there any other open issues they can be closed and copied here

with also specific urls to see the issue.

@infograf768 done so far.

Click on Login Form-Botton without filled User- and Password-Values:

url: http://wohlkoenig-4.joomla.com/index.php/fa/component/users/login?Itemid=101

That one looks fine. What do you think it should be?
(Looks to me we have an issue with the display of Joomla.alert when the alert is too long. Will look into this specifically but may require js)

Blue marked Text need right aligned below "x" as same as in LTR-Languages or here (second Sentence):

Afterthought:
the issue is with the Close button. It should be aligned left to solve the issue.
We have the same issue in back-end. Looking into it.

Yeah, that was it. ?

Just to remember for the alert

joomla-alert .joomla-alert--close, joomla-alert .joomla-alert-button--close {

    float: left;  // instead of right
    color: #000;
    background: 0 0;
    border: 0;
    opacity: .5;

}

joomla-alert .joomla-alert--close, joomla-alert .joomla-alert-button--close {

position: relative;
top: -.5rem;
left: -1.5rem; // instead of right
padding: .2rem 1rem;
color: inherit;

}

ALSO:
Cassiopea logo/description
should be

.container-header .navbar-brand {
    position: relative;
    display: inline-block;
    padding: 0;
    margin-left: auto; // instead of margin-right
    font-size: 2rem;
    color: #fefefe;
}

As far as I can tell this has been resolved elsewhere and can be closed. If there are other RTL issues then they should be opened in a new issue

Set to "closed" on behalf of @alikon by The JTracker Application at issues.joomla.org/joomla-cms/21750

Some aspects are solved, but NOT the display of the article info in Cassiopea as well as the logo description which should align right.

Will make patch.

Please test #27266