Enhance localization by completing missing translations across all locales + czech support

[github-roushan]

Describe Your Changes

• Adds Missing Keys for supported Localizations like (id, pl, etc..)
• Adds Language Support and Czech in Language Switcher
• Adds Czech locales for the app

Fixes Issues

• Closes feat: Czech language #6754
• Closes #

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed

[github-roushan]

@LazyYuuki

[github-roushan]

@louis-menlo

[LazyYuuki]

Hey @github-roushan we probably won't do a PR request to do translation moving forward, as we are trying to set up a weblate for our community to contribute from there instead.

[github-roushan]

why not use google translate?. @LazyYuuki

[github-roushan]

@LazyYuuki . Hey Although I understand going forward you will do it with weblate. But for now i guess this can be merged as this PR also contains missing Translations for already existing languages like "indonesian", "dutch" as your users are already using those and may get inconsistent or weak results

[github-roushan]

@LazyYuuki . Hey Although I understand going forward you will do it with weblate. But for now i guess this can be merged as this PR also contains missing Translations for already existing languages like "indonesian", "dutch" as your users are already using those and may get inconsistent or weak results

@LazyYuuki. Pinging again. other than czech translations this also contains missing translations for id, pl, zh-CN etc.
If you don't want cz i can remove it but for now can we mege this so other already supported languages have clear translations for all the pages?.

This can atleast improve the build for Nightly Users

[github-roushan]

@qnixsynapse . Since language pr's are now taken can you merge this as well. There are missing translations for already existing languages which pr resolves as well.

[github-roushan]

@louis-jan . can you check the language translations. Thank you.

Given that new pr's https://github.com/janhq/jan/pull/6898/files#diff-8225a52e7eea7c9245d84bf037dbb0b8b8c02341badd371a0a508eca48aa2c4f are adding more translations. I just want to ask to merge this as these pr also contains translations for already existing tokens for english that are missing fro langauges like dutch, chinese, indonesian etc.

The missing translations were found using running

/scripts//find-missing-translations.js from the jan source code directory