Add German translations

[took]

Feature: Add German translations

[what-the-diff[bot]]

PR Summary

• New German Language Support Added A new file messages/de/yii-validator.php has been included to establish translation for various data validation rules in German. Now German-speaking users can easily understand the notifications and messages regarding rule regulations. This enhancement should increase usability and comprehension for customers in German-speaking regions.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (010ac44) 12.24% compared to head (685905e) 94.45%. Report is 1 commits behind head on master.

:exclamation: Current head 685905e differs from pull request most recent head 3c1c384. Consider uploading reports for the commit 3c1c384 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #637 +/- ## ============================================= + Coverage 12.24% 94.45% +82.21% Complexity 776 776 ============================================= Files 91 91 Lines 2361 2361 ============================================= + Hits 289 2230 +1941 + Misses 2072 131 -1941 ```

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