It's not possible to override system locale

[qgib]

Author Name: Andrea Giudiceandrea (@agiudiceandrea)
Original Redmine Issue: 19879
Affected QGIS version: 3.3(master)
Redmine category:gui
Assignee: Jürgen Fischer

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In QGIS 3.3.0-master it seems impossible to change the user interface language.

My system locale is Italian (Windows 7 64 bit).

Checking "Override system locale" checkbox and setting "American English" (or any other language) in "User Interface Language" dropdown menu and then restarting QGIS, the user interface is always in Italian language.

Also tested with a new profile.

The bug doen't occur in QGIS 3.2.2 on the same system.

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Related issue(s): #26782 (duplicates), #27677 (relates), #27740 (relates)
Redmine related issue(s): 18951, 19853, 19916

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[qgib]

Author Name: Alessandro Pasotti (@elpaso)

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• assigned_to_id was configured as Alessandro Pasotti

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• relates was configured as Untranslated strings in QGIS #27677

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• assigned_to_id removed Alessandro Pasotti

[qgib]

Author Name: Tomas Straupis (@tomass)

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On linux I'm seeing an opposite thing: my locale is Lithuanian, but QGIS always shows English UI.
I've tried asking to override system locale in Settings->Options where QGIS correctly indicates, that my locale is Lithuanian, but UI stays English even after restart of QGIS.
(Worked correctly on master till ~this Monday)

[qgib]

Author Name: Borys Jurgiel (@borysiasty)

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See #27740

[qgib]

Author Name: Borys Jurgiel (@borysiasty)

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• relates was configured as Localization is broken in Linux #27740

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• assigned_to_id was configured as Jürgen Fischer

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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Applied in changeset 9c5d397.

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• status_id was changed from Open to Closed
• done_ratio was changed from 0 to 100

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• duplicated was configured as Layer-symbology menu do not change in any language #26782