I have a multilingual CiviCRM install with 3 languages. "Multiple Languages Support" is activated, and the fields with translation icon next to them have all been translated.
But I also need to translate the button "Confirm Contribution" at the bottom of the Contribution pages. How can I achieve this?
Since this needs to be translated to 3 languages, I can not use Word Replacements (word replacements is not multilingual, so it uses the same replacement in all languages)
Multilingual word replacement support is the topic of both CRM-14349 and CRM-19683. CRM-19683 just had a patch merged, which should be available in the January 2017 release of CiviCRM. You can patch it now if you're patch-savvy. Please try it and see if it solves your problem - or wait until January 2017, upgrade to CiviCRM 4.7.15+ and see if it solves your problem.
One way of doing this would be:
In this case you need to write an java script (Main.extra.tpl) to change the value of the button based on the language selected
I am not 100% sure but if I remember correctly there is actually a word replacement page for each language (at least it was like that in 4.3.x). If you are on the word replacement page and switch the ui language, it should provide you with a page that does replacements for English --> Current UI Language.
Another option would be to translate the strings on transifex (if they are coordinated via transifex) and update your transltion afterwards. Please find more information on the translation process here: https://wiki.civicrm.org/confluence/pages/viewpage.action?pageId=88408149
