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Created attachment 11345 [details]
Patch for ext.uls.init.js

Internet Explorer 8 generates

Meldung: Bezeichner, Zeichenfolge oder Zahl erwartet
Zeile: 254
Zeichen: 7
Code: 0
URI: http://example.org/w/extensions/UniversalLanguageSelector/resources/js/ext.uls.init.js

the property name 'class' must be quoted because it is a keyword:

use
  { 'class': 'uls-prevlang-link' }
instead of
  { class: 'uls-prevlang-link' }