[ENH] UDPIPE - Use ISO language codes

[PrimozGodec]

Issue

This PR is part of #963, which I am splitting into smaller pieces for easier review.

The primary motivation behind this is to make Preprocess work with language from Corpus.

Description of changes

This PR prepare a UDPIPE normalizer to communicate (get and return languages) as ISO codes, which is necessary to enable language from Corpus (languages are stored in Corpus in ISO format).

After I changed UDPIPE to work with ISO language codes, I also had to adapt the Preprocess Widget to store settings as ISO codes and call the Lemmagen filter with ISO language code.

This PR also slightly change the names of UDPIPE languages in the dropdown. The change is that the names of language variations (different models for the same language) are now written in parenthesis, and all words in the multi-word language are uppercase (to match ISO standard).

Udpipe will be implemented in separate PRs.

Includes

• Code changes
• Tests
• Documentation

[codecov-commenter]

Codecov Report

Merging #1030 (68966f4) into master (f519388) will increase coverage by 0.30%.
Report is 8 commits behind head on master.
The diff coverage is 95.10%.

❗ Current head 68966f4 differs from pull request most recent head 3a6f9b7. Consider uploading reports for the commit 3a6f9b7 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1030      +/-   ##
==========================================
+ Coverage   82.16%   82.46%   +0.30%     
==========================================
  Files          92       92              
  Lines       12283    12340      +57     
  Branches     1670     1683      +13     
==========================================
+ Hits        10092    10176      +84     
+ Misses       1882     1854      -28     
- Partials      309      310       +1     

[PrimozGodec]

@VesnaT, as #1025, you can make a workflow to test migration with tag 1.15.0 (git checkout 1.15.0) and open it with this change. It should work.

[PrimozGodec]

Failing tests are fixed in #1031

[PrimozGodec]

/rebase

[VesnaT]

When I open an old workflow I get

---------------------------- ValueError Exception -----------------------------
Traceback (most recent call last):
  File "/Users/vesna/orange3/Orange/widgets/utils/concurrent.py", line 591, in _on_task_done
    super()._on_task_done(future)
  File "/Users/vesna/orange3/Orange/widgets/utils/concurrent.py", line 549, in _on_task_done
    self.on_done(future.result())
  File "/Users/vesna/orange3-text/orangecontrib/text/widgets/owcorpus.py", line 257, in on_done
    self.openContext(self.corpus)
  File "/Users/vesna/orange-widget-base/orangewidget/widget.py", line 1351, in openContext
    self.settingsHandler.open_context(self, *a)
  File "/Users/vesna/orange3-text/orangecontrib/text/widgets/owcorpus.py", line 49, in open_context
    ContextHandler.open_context(
  File "/Users/vesna/orange-widget-base/orangewidget/settings.py", line 833, in open_context
    self.settings_to_widget(widget, *args)
  File "/Users/vesna/orange-widget-base/orangewidget/settings.py", line 945, in settings_to_widget
    _apply_setting(setting, instance, value)
  File "/Users/vesna/orange-widget-base/orangewidget/settings.py", line 204, in _apply_setting
    setattr(instance, setting.name, value)
  File "/Users/vesna/orange-widget-base/orangewidget/gui.py", line 194, in __setattr__
    callback(value)
  File "/Users/vesna/orange-widget-base/orangewidget/gui.py", line 2315, in __call__
    self.action(*args)
  File "/Users/vesna/orange-widget-base/orangewidget/gui.py", line 2405, in action
    raise ValueError("Combo box does not contain item " + repr(value))
ValueError: Combo box does not contain item 'Ancient greek'

[PrimozGodec]

The issue should be solved in #1034.

[PrimozGodec]

/rebase

[PrimozGodec]

@VesnaT, I fixed migrations, so I think it is ready for review.