fix escape sequences when extracting string literals

[nicksnyder]

fixes #233

[codecov]

Codecov Report

Merging #244 (799167e) into main (a5b9f57) will decrease coverage by 0.16%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main     #244      +/-   ##
==========================================
- Coverage   82.85%   82.68%   -0.17%     
==========================================
  Files          14       14              
  Lines        1178     1178              
==========================================
- Hits          976      974       -2     
- Misses        140      141       +1     
- Partials       62       63       +1     

Impacted Files	Coverage Δ
v2/goi18n/extract_command.go	64.59% <33.33%> (-1.25%)	⬇️

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