[FIX] Translatable strings in dropdown in admin backend

[ppfeufer]

Description

Fixed

• Translatable strings in dropdown in admin backend

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality not to work as expected)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented on my code, particularly in hard-to-understand areas
• [x] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

Merging #94 (eb0196f) into master (cef1e37) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #94   +/-   ##
=======================================
  Coverage   73.02%   73.02%           
=======================================
  Files          10       10           
  Lines         126      126           
  Branches        9        9           
=======================================
  Hits           92       92           
  Misses         33       33           
  Partials        1        1           

Files	Coverage Δ
timezones/admin.py	39.14% <100.00%> (ø)

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