This release address all most pending issues - hopefully completes #70

* form behavior now works as expected. If there are errors, the page form remains open and shows relevant error. If there are no errors in adding/edit of release notes, the whole page is reloaded and reflects the latest revised state of the custom field.
* It is now confirmed that all errors including the old one (blank text cann't be saved) now displays on the form. in the last check-in, even if the errors were detected, but not displayed properly on the rlease note divs.
* This error raised includes 'unable to find custom field', 'unable to save custom value' and 'failure in saving journal entry'.
* format_release_note_errors function is depricated and error messages are now structured properly in 3 locales.
* A bug in issue patch (function releses_note_status_done?) where cf is not found - the situation is now handled properly.
* Tested for all standard use cases
* Tested by eleminating cf in the background - after issue page is loaded. In such case edit will throw error as 'Unable to find custom field'