Add support for 20 new languages

[mark-kadence]

Add Support for 20 New Languages

This PR adds support for 20 new languages:

• Bulgarian (bg)
• Czech (cs)
• Welsh (cy)
• Estonian (et)
• Filipino (fil)
• Irish (ga)
• Croatian (hr)
• Hungarian (hu)
• Indonesian (id)
• Lithuanian (lt)
• Latvian (lv)
• Norwegian (nb)
• Romanian (ro)
• Slovak (sk)
• Slovenian (sl)
• Serbian (sr)
• Swahili (sw)
• Turkish (tr)
• Ukrainian (uk)
• Vietnamese (vi)
• Yoruba (yo)

Changes

• Added translation files for each new language in src/i18n/
• Each language file follows the established translation structure
• Maintains consistency with existing translation patterns

Testing

• Translations can be verified using the existing translation review tool:

  ./bin/review_translations.php --locale <locale>

[rlanvin]

Thanks but to be honest I don't know what to do with this MR. Usually I get MR from native speakers to add their own language, which gives me a certain degree of confidence that the translation works in context. The translation system in the lib is rather primitive and sometimes require some creative word-smithing in some languages. But this looks AI-generated and the list is very random, so how am I supposed to review that?

I have also some questions...

• Why those 20 languages in particular?
• Why Filipino specifically instead of Tagalog (tl)? Is there anything specific to Filipino in the translation?