Fix language prefix for Portuguese. Reported by le_

lang/Localization_en.json

@@ -188,7 +188,7 @@
 "languages.fas":"Persian",
 "languages.pol":"Polish",
 "languages.pus":"Pashto",
-"languages.pur":"Portuguese",
+"languages.por":"Portuguese",
 "languages.que":"Quechua",
 "languages.roh":"Romansh",
 "languages.run":"Kirundi",