Add alternative names for SubRegion

[ahmad88me]

No description provided.

[marianoeramirez]

thanks for the improvements. Can you please update the tests to reflect the new modifications?

[codecov]

Codecov Report

Merging #282 (0e4d0d9) into master (499fe89) will decrease coverage by 0.11%.
The diff coverage is 37.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #282      +/-   ##
==========================================
- Coverage   94.82%   94.72%   -0.11%     
==========================================
  Files          40       40              
  Lines        1682     1687       +5     
==========================================
+ Hits         1595     1598       +3     
- Misses         87       89       +2     

Files	Coverage Δ
...c/cities_light/management/commands/cities_light.py	87.70% <37.50%> (-0.34%)	⬇️