chore: update babel doc

[zhaoyongjie]

SUMMARY

In order to make .pot file and .po files to stay consistency.

1. add pybabel update in babel_update.sh
2. update contributing.md
3. update all .po files
4. update translation workflow

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

[codecov]

Codecov Report

Merging #17679 (342f891) into master (3350076) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #17679   +/-   ##
=======================================
  Coverage   68.85%   68.85%           
=======================================
  Files        1598     1598           
  Lines       65248    65248           
  Branches     6950     6950           
=======================================
  Hits        44929    44929           
  Misses      18434    18434           
  Partials     1885     1885           

Flag	Coverage Δ
hive	81.70% <ø> (ø)
mysql	82.11% <ø> (ø)
postgres	82.12% <ø> (ø)
python	82.46% <ø> (ø)
sqlite	81.80% <ø> (ø)

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[villebro]

LGTM 👍