L10n fallback does not work for TS labels
When retrieving a label in TypoScript (you should have French locales locally, but not French Canadian):
config.language = fr_CA page = PAGE page.10 = TEXT page.10.data = LLL:EXT:lang/locallang_general.xml:LGL.first_name
Fallback is not properly done if the translation (here in fr_CA) is not available. Instead it returns an empty string before 6.0 and the English label in 6.0).