Merge pull request #273 from piwik/translationupdates

[automatic translation update] Updated 70 strings in 38 languages (ar, be, bg, ca, cs, da, de, el, en, es, et, eu, fa, fi, fr, hi, hu, id, it, ja, ka, ko, lt, lv, nb, nl, nn, pl, pt, ru, sq, sr, sv, ta, th, tr, uk, vi)