Adding a Portuguese (PT) translation and making a dict for new ones

[villares]

Thank you so much for this color picker, it is just wonderful!

Feel free to ignore and close this PR. I just wanted to share some tweaks I'm experimenting for use with an educational creative coding tool (github.com/tabreturn/thonny-py5mode/)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 99.68%. Comparing base (407fe0e) to head (9c5268b).

Files with missing lines	Patch %	Lines
tkcolorpicker/colorpicker.py	71.42%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
+ Coverage   99.28%   99.68%   +0.39%     
==========================================
  Files           9        9              
  Lines        1265     1263       -2     
==========================================
+ Hits         1256     1259       +3     
+ Misses          9        4       -5     

Files with missing lines	Coverage Δ
tkcolorpicker/colorpicker.py	99.25% <71.42%> (+0.24%)	:arrow_up:

... and 2 files with indirect coverage changes

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