chore(de-translations): Add missing German translations

[hbruch]

SUMMARY

This PR adds messages which are now extracted from js/ts files again (see #17673).

Note: there are still messages which are not extracted, like e.g. those in superset-frontend/temporary_superset_ui subfolders. Is it intended not to have them extracted by now or should these folders be added to babel.cfg as well?

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

n.a.

TESTING INSTRUCTIONS

1. add "de": {"flag": "de", "name": "Deutsch"}, to the list of LANGUAGES
2. start superset an switch to Germann (Deutsch)

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 #17693 (1622165) into master (b7ae7f9) will decrease coverage by 0.04%.
The diff coverage is n/a.

❗ Current head 1622165 differs from pull request most recent head b41a9fc. Consider uploading reports for the commit b41a9fc to get more accurate results

@@            Coverage Diff             @@
##           master   #17693      +/-   ##
==========================================
- Coverage   68.87%   68.83%   -0.05%     
==========================================
  Files        1598     1598              
  Lines       65305    65305              
  Branches     6953     6953              
==========================================
- Hits        44978    44950      -28     
- Misses      18441    18469      +28     
  Partials     1886     1886              

Flag	Coverage Δ
hive	?
mysql	82.13% <ø> (ø)
postgres	82.14% <ø> (ø)
presto	82.00% <ø> (?)
python	82.39% <ø> (-0.10%)	⬇️
sqlite	81.82% <ø> (ø)

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

Impacted Files	Coverage Δ
superset/db_engines/hive.py	0.00% <0.00%> (-85.19%)	⬇️
superset/db_engine_specs/hive.py	70.27% <0.00%> (-16.99%)	⬇️
superset/utils/core.py	89.64% <0.00%> (-0.12%)	⬇️
superset/models/core.py	90.00% <0.00%> (+0.73%)	⬆️
superset/connectors/sqla/models.py	88.20% <0.00%> (+1.12%)	⬆️
superset/db_engine_specs/presto.py	89.97% <0.00%> (+5.63%)	⬆️

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[villebro]

Note: there are still messages which are not extracted, like e.g. those in superset-frontend/temporary_superset_ui subfolders. Is it intended not to have them extracted by now or should these folders be added to babel.cfg as well?

@hbruch the temporary files should not be translated, as they are pieces of code that are in transit (=being moved to the monorepo). Once they land in their final destination they should, however, be extracted.

[villebro]

LGTM!