Fix minor bugs

[dominik-zeglen]

I want to merge this change because it fixes some things:

1. user is now able to create customer without address
2. broken messages due to different variable names
3. country field in addresses is now properly validated

Screenshots

Pull Request Checklist

1. All visible strings are translated with proper context.
2. All data-formatting is locale-aware (dates, numbers, and so on).
3. Translated strings are extracted to .pot file.
4. Number of API calls is optimized.
5. The changes are tested.
6. Type definitions are up to date.
7. Changes are mentioned in the changelog.

[codecov]

Codecov Report

Merging #244 into master will decrease coverage by 0.02%.
The diff coverage is 61.53%.

@@            Coverage Diff             @@
##           master     #244      +/-   ##
==========================================
- Coverage      74%   73.97%   -0.03%     
==========================================
  Files         590      591       +1     
  Lines        6182     6195      +13     
  Branches     1040     1040              
==========================================
+ Hits         4575     4583       +8     
- Misses       1425     1430       +5     
  Partials      182      182

Impacted Files	Coverage Δ
.../OrderDraftCancelDialog/OrderDraftCancelDialog.tsx	100% <ø> (ø)	⬆️
.../OrderAddressEditDialog/OrderAddressEditDialog.tsx	76.92% <100%> (+4.19%)	⬆️
...ts/CustomerAddressDialog/CustomerAddressDialog.tsx	88% <100%> (+1.04%)	⬆️
src/hooks/useAddressValidation.ts	44.44% <44.44%> (ø)

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