Translate settings schema

[fcollonval]

References

Fixes jupyterlab/jupyterlab#10414
Fixes jupyterlab/jupyterlab-translate#1
Closes jupyterlab/jupyterlab#10752

Before	After

Code changes

The settings schemas are translated on the backend side before served to the frontend.

The code of the handlers was refactored.
The translation handler is now conditionned on the existence of settings configuration as they hold the locale source of thruth.

User changes

Settings translatable strings are displayed translated; in particular title and description in the setting editor.

Backward incompatible

N/A

[codecov-commenter]

Codecov Report

Merging #205 (f4090eb) into master (900ee8a) will decrease coverage by 0.66%.
The diff coverage is 79.06%.

@@            Coverage Diff             @@
##           master     #205      +/-   ##
==========================================
- Coverage   77.97%   77.30%   -0.67%     
==========================================
  Files          27       28       +1     
  Lines        1998     2058      +60     
==========================================
+ Hits         1558     1591      +33     
- Misses        440      467      +27     

Impacted Files	Coverage Δ
jupyterlab_server/translation_utils.py	75.60% <50.87%> (-7.08%)	⬇️
jupyterlab_server/settings_utils.py	85.22% <85.22%> (ø)
jupyterlab_server/handlers.py	87.82% <100.00%> (ø)
jupyterlab_server/settings_handler.py	87.50% <100.00%> (+2.43%)	⬆️
jupyterlab_server/translations_handler.py	92.30% <100.00%> (+0.64%)	⬆️

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[blink1073]

Thank you!

[blink1073]

I'll cut this release tomorrow

[krassowski]

Thank you!