Rename setting 'Userinterface size' to 'Font and icon size'
Refresh language files
Improve charset decoding

Add new codepages 1254, 1257 and 1258

Also add all alises listed at
  http://www.iana.org/assignments/character-sets/character-sets.xhtml
Rewrite JSON string parser so it does not choke on escaped backslash before end of string
JSON: Read raw string as utf-8, not as latin-1
js: Fix regression with setting.createString()

No default value was set after the rewrite of the setting system

Fixes #1722