Improve Japanese support

[smurak]

Thank you for maintaining this very useful library.

I've just improved Japanese support a little.
Please check if this is ok.

[serhii73]

Hi @smurak
Could you please resolve the conflicts? Thanks in advance.

[smurak]

Hi @smurak Could you please resolve the conflicts? Thanks in advance.

Thanks for checking, @serhii73 .
Resolved conflicts.

[codecov]

Codecov Report

Base: 98.23% // Head: 98.23% // No change to project coverage 👍

Coverage data is based on head (f2dfdfd) compared to base (0cbf46a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1068   +/-   ##
=======================================
  Coverage   98.23%   98.23%           
=======================================
  Files         232      232           
  Lines        2605     2605           
=======================================
  Hits         2559     2559           
  Misses         46       46           

Impacted Files	Coverage Δ
dateparser/data/date_translation_data/ja.py	100.00% <ø> (ø)

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[serhii73]

LGTM

[Gallaecio]

Thanks!