fix(i18n): update Russian translation

[PolinaFam]

SUMMARY

This PR updates language files, as described in the documentation. Manual changes were made only in file with Russian localization:

• Fixed typos and written language style issues
• Added missing translations
• Cleaned up fuzzy strings
• Fixed translations causing layout breaks (marked with comments)
• Marked non-translatable strings with "Не переводить" comments

I made up the following glossary:

alert - оповещение
bins - бины
chart - диаграмма
cluster - кластер
column - столбец
cross-filter - кросс-фильтр
cross-filtering - кросс-фильтрация
dashboard - дашборд
dataset - датасет
label - метка
metric - мера
option (булевая) - флаг
outlier - выброс
range - диапазон
redirect - перенаправление
report - отчет
spread - разброс
tag - тег
threshold - порог
tooltip - всплывающая подсказка
zoom - масштабирование

This is part of ongoing efforts to improve Superset’s Russian localization. Hope these improvements will enhance the user experience for Russian-speaking users.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.99%. Comparing base (7d0fabe) to head (fa17e45).
Report is 4 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #34005       +/-   ##
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+ Coverage        0   72.99%   +72.99%     
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  Files           0      559      +559     
  Lines           0    40517    +40517     
  Branches        0     4267     +4267     
===========================================
+ Hits            0    29574    +29574     
- Misses          0     9834     +9834     
- Partials        0     1109     +1109     

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mysql	71.98% <ø> (?)
postgres	72.03% <ø> (?)
presto	50.90% <ø> (?)
python	72.95% <ø> (?)
sqlite	71.57% <ø> (?)
unit	100.00% <ø> (?)

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[Quatters]

Comment here says "If you translate literally, then markup breaks" (because of long phrase). I think we should fix markup instead of adjusting translations.

@rusackas @michael-s-molina @mistercrunch what do you think?

[mistercrunch]

Probably yes, though breaking long strings into smaller ones will disconnect all existing translations in other language, forcing to retranslate the long strings. So some tradeoffs here.

A while back I worked on an AI-powered babel-based translation framework for .po files, but never finished it. Ideally we start using something like that soon. I haven't looked to see if other frameworks have popped up over the past few months, but would be great to set this thing in motion and automate filling all missing translations.

[PolinaFam]

I agree that it would be better to fix markup but not in this PR. These changes are supposed to fill empty translations and fix fuzzy strings for Russian language. If you don't mind I would create another PR with markup fixes. What do you think?

[mistercrunch]

Fine by me personally

[Quatters]

LGTM