[5.4] Fix issues in language installer

[bembelimen]

Summary of Changes

When installing a language during installing Joomla! there are two issues:

• the new "Automated Updates" box does not disappear when switching to the language installer
• when the language installation is started, it seems like Joomla! is stuck, but it just installs the languages and then shows the joomla loader

This PR fixes the issues

Testing Instructions

• Apply patch
• Install Joomla!
• Install aftwards before deleting the installation folder install some languages

Actual result BEFORE applying this Pull Request

Automated Updates box visible:

No Joomla Loader:

Expected result AFTER applying this Pull Request

No Automated Updates box:

Joomla Loader directly visible when pressing "Install Selected Language":

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[chmst]

I have tested this item ✅ successfully on 79c410a

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[tecpromotion]

I have tested this item ✅ successfully on 79c410a

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[tecpromotion]

RTC

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[heelc29]

For the "automated update" box, I have already created a PR #46275 to address this issue.
In your PR the check is missing if the element exists. This can happen if you disable the updates, then switch to languages and skip the installation. This will result in a javascript error.

[bembelimen]

For the "automated update" box, I have already created a PR #46275 to address this issue. In your PR the check is missing if the element exists. This can happen if you disable the updates, then switch to languages and skip the installation. This will result in a javascript error.

Good point, it was worse, the box was always visible, although the automated updates were disabled, after refreshing the page. It's not fixed.

[muhme]

Reset to ‘Pending’ because there were changes to the code. @chmst and @tecpromotion, could you please test this PR again?

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[tecpromotion]

I have tested this item ✅ successfully on b3e7ed8

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[chmst]

I have tested this item ✅ successfully on b3e7ed8

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/46403.}

[chmst]

RTC

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[chmst]

I am wondering why the language configuration scree is not closed. But this was already in oler versions.
@heelc29 thanks for your RP #46275 and your commit here. Are you all right with this PR or have you more concerns?