Fix bug: EWD-24273 Preview and publishing doesn't work for early created courses

EWD-24273 - Preview and publishing doesn't work for early created courses
EWD-24281 - Custom language values for early created courses
And some markup changes:
EWD-24271 - Incorrect markup for Ukrainian localization in flat scheme.
EWD-24283 - Incorrect markup of "No questions" for Dutch and Ukrainian