Support for empty strings

You cannot substitute an empty string in the primary locale. Use space characters. When you set an empty string for a primary locale, the empty string is propagated to all other locales that don't have translations.

Performing a first time substitution of an empty string in a secondary locale puts a space character in the primary and the current locale. The remaining locales will match the primary value if they don't already have a specific value.

If a primary locale contains an empty string, it will be exported for translation.

If you substitute an empty string for a secondary locale, the element shows as empty. However, if you switch to the primary locale and then back to the secondary locale, the element shows the primary string substitution again.