Adds fall-through for setting locale to fix ipwb on Android

[machawk1]

Fixes #602

[codecov]

Codecov Report

Merging #619 into master will increase coverage by 0.02%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #619      +/-   ##
==========================================
+ Coverage   24.37%   24.39%   +0.02%     
==========================================
  Files           6        6              
  Lines        1231     1234       +3     
  Branches      185      185              
==========================================
+ Hits          300      301       +1     
- Misses        907      909       +2     
  Partials       24       24

Impacted Files	Coverage Δ
ipwb/util.py	35.21% <50%> (-0.03%)	⬇️

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[codecov]

Codecov Report

Merging #619 into master will increase coverage by 0.02%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #619      +/-   ##
==========================================
+ Coverage   24.37%   24.39%   +0.02%     
==========================================
  Files           6        6              
  Lines        1231     1234       +3     
  Branches      185      185              
==========================================
+ Hits          300      301       +1     
- Misses        907      909       +2     
  Partials       24       24

Impacted Files	Coverage Δ
ipwb/util.py	35.21% <50%> (-0.03%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 753af60...9fd82fa. Read the comment docs.

[machawk1]

Yeah, yeah, this violates DRY but I can't seem to find a better way to detect Android and this is a safer default for any misc systems that don't have one of the pre-defined locales available.