fix(application): Correcting the loading of translation files

[findlayfeng]

Now, it attempts to load all values ​​returned by the function QLocale::system().uiLanguages() sequentially until success or all values ​​fail, instead of only trying the first value.

#8092

[mgallien]

see the inline comments

[github-actions]

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[mgallien]

please fix the compilation errors on Linux
you can have a look at https://github.com/nextcloud/desktop/actions/runs/19921541571/job/57111130337?pr=9108

[findlayfeng]

@mgallien
Can this patch be applied? The user's client version has been stuck on version 3.13.3 for too long.

[nilsding]

Thanks for your contribution, it seems to work fine from my end (tested this by changing the LANGUAGE env var to e.g. zh_CN or de_AT)

[github-actions]

Artifact containing the AppImage: nextcloud-appimage-pr-9108.zip

Digest: sha256:5215b9f8df431d3ecc5fb85e04c9c06b758f48f13c0a6d90fad790070ca92c55

To test this change/fix you can download the above artifact file, unzip it, and run it.

Please make sure to quit your existing Nextcloud app and backup your data.