Fix NL translations

Fixes #216
[fr] Update payment_processing_failed, payment_processor_choose_banner_text and
payment_processor_choose_link translations

modified payment_processing_failed: french translation
added payment_processor_choose_banner_text:  french translation
added payment_processor_choose_link: french translation
Require rails-i18n so main application loads it. [Fix #224]
bump from upstream