feat: translations

[Computerdores]

Implements Translation using the translation files from weblate. Also modifies en.json when necessary.

For testing go to src/qt/translations.py and either:

1. add Translations.change_language("<language of choice>") at the end of the file,
2. or uncomment return "???" in __getitem__.

The first option should leave untranslated strings in Englisch while the second should replace every string that is effected by translations to ???.

Notes:

• preview_panel.py isn't translated completely, mostly due to ongoing refactoring of that file in other places
  • reverting the changes to this file might be a good idea

Close #598.
Close #447.
Close #524.

[CyanVoxel]

Just a note, I would avoid renaming the keys if possible or else I don't think Weblate will know how to propagate those changes automatically. In f4b30c1 I had to update the keys across all translation files simultaneously before updating on the Weblate side.

[Computerdores]

This PR is now ready for review

[Computerdores]

@CyanVoxel could you have a look a my responses to the review comments once you have time?

[CyanVoxel]

Everything else is looking great, there's just one last issues I've run into - when my program was translated to German it wouldn't function properly, specifically with the item thumbnails. No files could render thumbnails or be selected and when closing the library I'd get a very long succession of tracebacks:
(Truncated):

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "F:\GitHub\TagStudio/tagstudio\src\qt\widgets\item_thumb.py", line 210, in <lambda>
    self.update_thumb(ts, image=i),
    ^^^^^^^^^^^^^^^^^
SystemError: <class 'method'> returned a result with an exception set

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "F:\GitHub\TagStudio/tagstudio\src\qt\widgets\item_thumb.py", line 210, in <lambda>
    self.update_thumb(ts, image=i),
    ^^^^^^^^^^^^^^^^^
SystemError: <class 'method'> returned a result with an exception set

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "F:\GitHub\TagStudio/tagstudio\src\qt\widgets\item_thumb.py", line 210, in <lambda>
    self.update_thumb(ts, image=i),
    ^^^^^^^^^^^^^^^^^
SystemError: <class 'method'> returned a result with an exception set

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "F:\GitHub\TagStudio/tagstudio/tag_studio.py", line 65, in main
    driver.start()
  File "F:\GitHub\TagStudio/tagstudio\src\qt\ts_qt.py", line 511, in start
    app.exec()
  File "F:\GitHub\TagStudio/tagstudio\src\qt\widgets\item_thumb.py", line 210, in <lambda>
    self.update_thumb(ts, image=i),
    ^^^^^^^^^^^^^^^^^
SystemError: <class 'method'> returned a result with an exception set

TagStudio Frontend (Qt) Crashed! Press Enter to Continue...

[Computerdores]

Everything else is looking great, there's just one last issues I've run into - when my program was translated to German it wouldn't function properly, specifically with the item thumbnails. No files could render thumbnails or be selected and when closing the library I'd get a very long succession of tracebacks: (Truncated):

Do you know what you were doing when that happened? Because this doesn't happen for me and the traceback is basically useless (the file in which the error occurs wasn't even modified by this PR)

[CyanVoxel]

Everything else is looking great, there's just one last issues I've run into - when my program was translated to German it wouldn't function properly, specifically with the item thumbnails. No files could render thumbnails or be selected and when closing the library I'd get a very long succession of tracebacks: (Truncated):

Do you know what you were doing when that happened? Because this doesn't happen for me and the traceback is basically useless (the file in which the error occurs wasn't even modified by this PR)

The item thumbnails break when opening the library, and the crash + traceback occurs when closing the library. Happens to me on Windows and macOS

Happens to me under multiple languages, and opening other test libraries either gives me the same error or a new set of errors (looks like from trying to add new files):

QPainter::begin: Paint device returned engine == 0, type: 0
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::fillRect: Painter not active
QPainter::begin: Paint device returned engine == 0, type: 0
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::fillRect: Painter not active
QPainter::begin: Paint device returned engine == 0, type: 0
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::fillRect: Painter not active
Traceback (most recent call last):
  File "/Users/cyanvoxel/Files/GitHub/TagStudio/tagstudio/tag_studio.py", line 65, in main
    driver.start()
  File "/Users/cyanvoxel/Files/GitHub/TagStudio/tagstudio/src/qt/ts_qt.py", line 511, in start
    app.exec()
  File "/Users/cyanvoxel/Files/GitHub/TagStudio/tagstudio/src/qt/ts_qt.py", line 757, in <lambda>
    self.add_new_files_runnable(tracker),
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/cyanvoxel/Files/GitHub/TagStudio/tagstudio/src/qt/ts_qt.py", line 776, in add_new_files_runnable
    Translations.translate_with_setter(
  File "/Users/cyanvoxel/Files/GitHub/TagStudio/tagstudio/src/qt/translations.py", line 74, in translate_with_setter
    set_text(self.translate_formatted(key, **kwargs))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/cyanvoxel/Files/GitHub/TagStudio/tagstudio/src/qt/translations.py", line 77, in translate_formatted
    return self[key].format(**kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
KeyError: 'x + 1'

TagStudio Frontend (Qt) Crashed! Press Enter to Continue...

[CyanVoxel]

Adding a "Blocked" label to remind myself to temporarily close the Weblate translations before pulling this to avoid merge conflicts

[Computerdores]

The KeyError is definitely not the cause of the crashes - it comes from the other translations having broken formatting (e.g. "Test {x + 1} asd" is an example that would cause the error from above). Should be fixed now nonetheless

[Computerdores]

I still can't reproduce the crash though

[CyanVoxel]

Everything seems to be fixed for me now as of cc4b6df, minus the uncommented Translations.change_language("de") regression. The KeyError crash occurred for me on a library with mostly unlinked entries and possibly some new files that weren't already in the library, while the SystemError crash was purely just from opening and closing any other library with the translations activated. In any case, they seem to be fixed!

[Computerdores]

The regression is fixed now - should be good to merge then, right?

[CyanVoxel]

Fixed up a couple things with the en.json file, but other than that I think that's everything! Thank you so much for your work on this!