add link to LOCALIZATION.md in README.md

README.md

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 # ink/stitch: An Inkscape extension for designing machine embroidery patterns
 
+* February 5, 2018: Portuguese (pt_PT) translation added!  [Want to help translate?](LOCALIZATION.md)
 * January 5, 2018: Default DPI changed to 96, to match Inkscape.
 * January 3, 2018: Project renamed from `inkscape-embroidery` to **ink/stitch**
 * **NEW January 1, 2018:** [video demo of the new live stitch preview feature](https://youtu.be/QY9NcLN3oJM)