UCM11 — remove class ProgrammingLanguages from the meta-model, as it is useless

Class ProgrammingLanguages had been created to gather programming language declarations and avoid having them scattered in NonfunctionalAspectModule. In the actuality, it creates unnecessary complexity when creating tools without bringing real advantage. It is better to simply remove it and have its contents (class Language) directly linked with class NonfunctionalAspectModule, as illustrated in the attached diagram.

remove class ProgrammingLanguages

The change consists of having programming language declarations directly in Nonfunctional modules, instead of nesting them in the intermediate class ProgrammingLanguages.