Happy to be of assistance! If you'd like to force your copy of OmniFocus to use the English localization, just open up the following page using Safari on your iPhone. Once there, tap the "Use English for OmniFocus" link, and a hidden preference will be set on your phone.
The page you want:
http://people.omnigroup.com/kc/Debug...eLanguage.html
(You can use the "Reset language for OmniFocus" link if you'd ever like to switch back to the default localization.)