Translations:Extend FEM Module/6/en

The build system must be modified regardless of which objects shall be added o the FEM workbench. Every python module (file) must be registered. The FEM workbench requires every new python module to be registered in. This is true regardless of the type of the python module (GUI or non-GUI). Where exactly the module must be inserted depends on the role of the module. Solver, equations and constraints all use different lists. Searching for similar files and inserting the new file in the same list works most of the time.