chore(translation): add missing Russian translation, add plural forms

[artemonsh]

SUMMARY

This PR intends to improve russian translation.
The binary .mo file now can be successfully compiled as all errors were resolved, hence backend part is localized, too.
Plural Forms added as they were incorrect before.

Untranslated messages with msgstr "" dropped from 949 to 306.

BEFORE SCREENSHOT

AFTER SCREENSHOT

This is just one of the examples. A lot more translations are added/fixed.

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

[codecov]

Codecov Report

Merging #22415 (d57ae0b) into master (80b3113) will decrease coverage by 0.13%.
The diff coverage is 33.33%.

❗ Current head d57ae0b differs from pull request most recent head 8aa57d4. Consider uploading reports for the commit 8aa57d4 to get more accurate results

@@            Coverage Diff             @@
##           master   #22415      +/-   ##
==========================================
- Coverage   67.11%   66.98%   -0.13%     
==========================================
  Files        1869     1876       +7     
  Lines       71612    71812     +200     
  Branches     7822     7863      +41     
==========================================
+ Hits        48059    48103      +44     
- Misses      21526    21683     +157     
+ Partials     2027     2026       -1     

Flag	Coverage Δ
hive	52.60% <63.04%> (+0.01%)	⬆️
mysql	?
postgres	78.12% <93.47%> (+0.01%)	⬆️
presto	52.49% <63.04%> (+0.01%)	⬆️
python	81.33% <100.00%> (-0.02%)	⬇️
sqlite	76.50% <93.47%> (+0.02%)	⬆️
unit	51.54% <86.95%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...gin-chart-echarts/src/Sunburst/EchartsSunburst.tsx	0.00% <0.00%> (ø)
...ns/plugin-chart-echarts/src/Sunburst/buildQuery.ts	0.00% <0.00%> (ø)
...plugins/plugin-chart-echarts/src/Sunburst/index.ts	0.00% <0.00%> (ø)
...lugin-chart-echarts/src/Sunburst/transformProps.ts	0.00% <0.00%> (ø)
...gins/plugin-chart-echarts/src/Treemap/constants.ts	54.54% <ø> (ø)
.../plugins/plugin-chart-echarts/src/Treemap/types.ts	100.00% <ø> (ø)
superset-frontend/src/GlobalStyles.tsx	0.00% <ø> (ø)
superset-frontend/src/SqlLab/actions/sqlLab.js	63.56% <ø> (ø)
superset/constants.py	100.00% <ø> (ø)
superset-frontend/src/components/Modal/Modal.tsx	85.89% <25.00%> (-3.30%)	⬇️
... and 13 more

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