extract concatenated strings

[nicksnyder]

fixes #142

[codecov]

Codecov Report

Merging #143 into master will decrease coverage by 0.04%.
The diff coverage is 57.89%.

@@            Coverage Diff             @@
##           master     #143      +/-   ##
==========================================
- Coverage   67.63%   67.58%   -0.05%     
==========================================
  Files          28       28              
  Lines        2283     2298      +15     
==========================================
+ Hits         1544     1553       +9     
- Misses        660      663       +3     
- Partials       79       82       +3

Impacted Files	Coverage Δ
v2/goi18n/extract_command.go	63.07% <57.89%> (-0.41%)	⬇️

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