Targeting #63:
added localization methods;
added german and english lang file stubs
closed some readers/writers
Targeting #63:
added locale setting in settings file;
added button in tool bar to change language;
improved exception catching related to language/settings, I will improve
the other parts later, they are mostly only "caught" with a stack trace
Resolves #63:
added option pane to show language switch;
replaced strings with localization method call;
added locale for en;
improved tooltip and label text
Related to #63:
added locale de;
improved locale en;
fixed button tooltips in context editor