feat: Xcstrings

[serhii-londar]

Closes #271

[crowdin-bot]

	Warnings
⚠️	Big PR, try to keep changes smaller if you can

Generated by 🚫 Danger Swift against 73c0410

[codecov]

Codecov Report

Attention: Patch coverage is 17.24138% with 120 lines in your changes are missing coverage. Please review.

Project coverage is 58.10%. Comparing base (b064507) to head (7bcd7e0).
Report is 5 commits behind head on master.

❗ Current head 7bcd7e0 differs from pull request most recent head 73c0410. Consider uploading reports for the commit 73c0410 to get more accurate results

Files	Patch %	Lines
...Operations/CrowdinXcstringsDownloadOperation.swift	0.00%	88 Missing ⚠️
...tionDownloader/CrowdinLocalizationDownloader.swift	25.00%	12 Missing ⚠️
...owdinSDK/CrowdinFileSystem/ReadWriteProtocol.swift	0.00%	9 Missing ⚠️
...ContentDeliveryAPI/CrowdinContentDeliveryAPI.swift	0.00%	7 Missing ⚠️
...ers/Crowdin/CrowdinRemoteLocalizationStorage.swift	33.34%	2 Missing ⚠️
...wdin/MappingDownloader/CrowdinMappingManager.swift	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #276      +/-   ##
==========================================
- Coverage   59.50%   58.10%   -1.40%     
==========================================
  Files         121      122       +1     
  Lines        4422     4551     +129     
==========================================
+ Hits         2631     2644      +13     
- Misses       1791     1907     +116     

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