i18n(pt/pt_BR): update Portuguese translations and rebuild translation index

[israelddiacov]

SUMMARY

This PR completes and refines the Portuguese (pt and pt_BR) language translations for Apache Superset.

Key updates:

• Translated untranslated strings across messages.po for pt_BR and pt catalogs.
• Updated and compiled gettext catalogs (messages.mo) and frontend React JSON translation catalogs (messages.json).
• Refined UI interactivity terminology (such as "Drill by", "Drill to detail", legend placement, and action headers).
• Rebuilt translation_index.json via scripts/translations/build_translation_index.py indexing 5,039 entries.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A (Localization catalog updates)

TESTING INSTRUCTIONS

1. Change user language setting to Portuguese (pt_BR or pt).
2. Navigate through the Home page, Chart explore view, and Saved Queries list.
3. Verify that table headers, tab titles, and chart action menus display correctly in Portuguese.

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 66.55%. Comparing base (5ee2793) to head (2545efb).

Additional details and impacted files

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  Coverage   66.55%   66.55%           
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  Files        2864     2864           
  Lines      161894   161894           
  Branches    37305    37305           
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  Hits       107742   107742           
  Misses      52106    52106           
  Partials     2046     2046           

Flag	Coverage Δ
hive	38.15% <ø> (ø)
mysql	57.68% <ø> (ø)
postgres	57.73% <ø> (ø)
presto	40.11% <ø> (ø)
python	59.12% <ø> (ø)
sqlite	57.35% <ø> (ø)
unit	100.00% <ø> (ø)

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