Translations:Add FEM Equation Tutorial/8/en

Those two classes will later be used as base classes for the Elmer specific equation classes. In addition to those base classes we have to create a new command class that adds a flow equation to the selected solver object. Additionally, the new .svg image has to be registered for the GUI-button with in {{incode|Fem.qrc} (in ). The related .svg has to be put into.