Introduce functionality for splitting translation workload among teams

[MichaelChirico]

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Closes #75

[codecov-commenter]

Codecov Report

Merging #172 (06d97f4) into master (7103fa6) will decrease coverage by 2.88%. The diff coverage is 25.00%.

@@            Coverage Diff             @@
##           master     #172      +/-   ##
==========================================
- Coverage   98.56%   95.68%   -2.89%     
==========================================
  Files          15       15              
  Lines        1182     1227      +45     
==========================================
+ Hits         1165     1174       +9     
- Misses         17       53      +36     

Impacted Files	Coverage Δ
R/translate_package.R	79.88% <23.40%> (-20.12%)	:arrow_down:
R/msgmerge.R	88.88% <100.00%> (ø)

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