Example: The string can not exceed %42% characters. - the %'s shouldn't be there. The translation parameters are not %-wrapped, which means the %'s that exist in the translation string won't be removed when parameters are inserted.

These strings end up in the Symfony Translator which uses http://php.net/manual/en/function.strtr.php and that makes no assumptions about %'s, it simply replaces strings verbatim. So if strings are %-wrapped in the translation string, they must also be so in the parameters: http://symfony.com/doc/2.7/components/translation/usage.html#message-placeholders

The kernel fix for this triggers an error in repository-forms, which does automatic %-wrapping. The repository-forms PR fixes this.

STEPS TO REPRODUCE (REST):

• Use a content type with a textline that has min/max length set
• Using REST, create a content of this type, submitting a string of invalid length for the textline
• See that the error message in the REST response has %'s around the integer value

STEPS TO REPRODUCE (REPOSITORY-FORMS)

• Apply the kernel fix
• Use the same content type as above
• Use UGC/nodraft feature to create content of this type: http://example.com/content/create/nodraft/my_type_identifier/eng-GB/2
• Submit a string of invalid length
• See that the error message contains %size% instead of the actual number
• Apply the repository-forms fix, see that it works now