simplify TextLine, use only text and drop symbols
several fixes for translations
simplifying translation by joining multi part strings

Correcting some apparent errors and adding some missing translations in
the due course
'untranslate' some strings from the debugger
adding/removing colons in some dialogs

and making insert measure dialog similar to append measures dialog
a couple more colons added/removed from some dialogs
untranslate yet another string from debugger