Added three Uralic languages and Klingon to post tags

Added Erzya, Moksha, Udmurt, and Klingon to the list of languages that a
user can tag a post as being written in.

app/helpers/languages_helper.rb

@@ -197,7 +197,9 @@ module LanguagesHelper
     kab: ['Kabyle', 'Taqbaylit'].freeze,
     ldn: ['Láadan', 'Láadan'].freeze,
     lfn: ['Lingua Franca Nova', 'lingua franca nova'].freeze,
+    mdf: ['Moksha', 'Мокшень кяль'].freeze,
     moh: ['Mohawk', 'Kanienʼkéha'].freeze,
+    myv: ['Erzya', 'Эрзянь кель'].freeze,
     nds: ['Low German', 'Plattdüütsch'].freeze,
     pdc: ['Pennsylvania Dutch', 'Pennsilfaani-Deitsch'].freeze,
     sco: ['Scots', 'Scots'].freeze,
@@ -205,6 +207,8 @@ module LanguagesHelper
     smj: ['Lule Sami', 'Julevsámegiella'].freeze,
     szl: ['Silesian', 'ślůnsko godka'].freeze,
     tok: ['Toki Pona', 'toki pona'].freeze,
+    tlh: ['Klingon', 'tlhIngan Hol'].freeze,
+    udm: ['Udmurt', 'Удмурт кыл'].freeze,
     vai: ['Vai', 'ꕙꔤ'].freeze,
     xal: ['Kalmyk', 'Хальмг келн'].freeze,
     zba: ['Balaibalan', 'باليبلن'].freeze,