Don’t know, but here is the European Commission’s page on regional and minority langusges.
I don’t see references to directives (or regulations or more generally legislation), so without further research I would doubt it.
http://ec.europa.eu/languages/languages-of-europe/regional-and-minority-languages_en.htm
The treaties have the following
Article 21
Non-discrimination
1. Any discrimination based on any ground such as sex, race, colour, ethnic or social origin, genetic features, language, religion or belief, political or any other opinion, membership of a national minority, property, birth, disability, age or sexual orientation shall be prohibited.
(Specifcially, it is in the Treaty on the Functioning of the European Union.)
