[README] add crowdin badge

[6543]

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[codecov-io]

Codecov Report

Merging #8447 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #8447      +/-   ##
=========================================
+ Coverage   41.79%   41.8%   +0.01%     
=========================================
  Files         497     497              
  Lines       65639   65639              
=========================================
+ Hits        27433   27441       +8     
+ Misses      34689   34680       -9     
- Partials     3517    3518       +1

Impacted Files	Coverage Δ
routers/repo/view.go	43.32% <0%> (+1%)	⬆️
modules/log/event.go	65.64% <0%> (+1.02%)	⬆️
models/unit.go	67.56% <0%> (+5.4%)	⬆️

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