Improved identical validator

- The identical is now only needed on the field you want to be identical to another field
- An empty field does not validate for identical if the other field is not empty
Updated demos for improved identical validator
Updated i18n test for improved identical validator
Add option to set optional protocola in uri validation
Add unit test to uri validator
Change _isOptionEnabled() to public method (isOptionEnabled)
#708, #899: Add multilingual add-on
Added BIC code validator
Fixed typo
Removed unneeded quotes
Removed unneeded quotes
Updated German translations
Removed debug statments
Allow lower case letters
Updated message validation
Merge pull request #1165 from thomaslhotta/master

Added BIC (ISO 9362) code validator
#1165: Add BIC (ISO 9362) validator, thanks to @thomaslhotta
#1165: Update language packages
#708, #899:  multilingual add-on example
#718: Add validateContainer() method