Reply To: form filling error messages not translating

The englisch parts in other languages are just not translated.
The mixed languages come from parts that get loaded with ajax. I had to write a function to load the correct language in ajax requests, there will come the error from. Unfortunately I can’t reproduce it.
Does it have any pattern like the last selected language comes up in the table instead of the current select?

For the questions:
Every string is somewhere in the .po file. Each billing interval like weeks has it’s own column.

For your suggestion you can simply use custom fields as checkbox or radio buttons. They can be set mandatory.

Regards