[4.x] Fix default language value for taxonomy rows

[SniperSister]

Summary of Changes

So far com_finder taxonomy rows had an empty string as default parameter for the language column. Taxonomy rows with that empty string became unselectable one the multilanguage feature was enabled, as the language filter only filtered for the current language and the * character, see:
https://github.com/joomla/joomla-cms/blob/4.4-dev/administrator/components/com_finder/src/Service/HTML/Filter.php#L306

Testing Instructions

• Run the finder indexer, view the #__finder_taxonomy table and check the taxonomy column values.
• Apply the patch.
• Reindex
• Check the DB table again

Actual result BEFORE applying this Pull Request

Rows with empty string.

Expected result AFTER applying this Pull Request

Rows with empty strings are now using * as value

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

[ghost]

I have tested this item ✅ successfully on c61e65b

Without Patch:

With Patch:

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[SniperSister]

@fgsw thanks for testing, that's very much appreciated! I have pushed another commit that will also fix the language in the first taxonomy levels that you marked red in your screenshot. Could you please re-rest? THANK YOU!

[ghost]

I have tested this item ✅ successfully on 0120dfd

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43990.}

[ChristineWk]

@fgsw Thank you for screenshots for my better understanding :-)

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43990.}

[ChristineWk]

I have tested this item ✅ successfully on 0120dfd

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43990.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43990.}