Update 15/umbraco-forms/developer/localization.md

Co-authored-by: Esha Noronha <[email protected]>

Author: lofstrand

15/umbraco-forms/developer/localization.md

@@ -19,6 +19,7 @@ Umbraco Forms ships with translations for the following languages:
  - Italian (`it-it.js`)
  - Polish (`pl-pl.js`)
  - Spanish (`es-es.js`)
+ - UK English (`en-gb.js`)
  - US English (`en.js`)
 
 If the language you require does not exist, it's possible to create your own by duplicating the default `en.js` file.  You can then save it with the appropriate culture code for the language you need and replace the English text with the translated version.