Would you recommend installing Open Office 2 or 3 if we want Catalan language spell checking?
No. I was trying to tell you that the dictionary from OpenOffice 2 can be used in OS X and Pages. You download the .dic and .aff file from the link I gave you and put them in Home/Library/Spelling.
Mac OS X and other Mac Apps is only available in the 18 languages?
Yes, as it clearly says in the published tech specs for the OS.
When we updated to 10.6.4 and went to the Edit List option in the Language setting there was quite a comprehensive list of other languages. Are you saying that these languages don´t have real support by Mac OS X and Mac applications?
There are something like 130 languages on that list, but only 18 have menus/dialogues translations. The others have lesser support. For example, if you set system prefs/language & text/format to Catalan you can have various other things including calendars set for that locale.
we took a ´leap of faith´ by purchasing Mac for the first time after being quite content with the language support in the various applications under Windows Applications.
Unfortunately Mac has never equaled Windows as far as the number of localizations is concerned. On the other hand, every copy of OS X does all 18 languages, while Windows and Office often require buying separate copies for different languages.
You can ask Apple to add Catalan here:
http://www.apple.com/feedback/macosx.html