Sketcher: fix typos + capitalize openCommand() text [skip-ci]

[luzpaz]

No description provided.

[luzpaz]

@wmayer quick question, is there a technical reason why the text fields in 4499508 aren't translatable ?

[wwmayer]

No. There is no reason to not translate them. In order to do that the macro QT_TRANSLATE_NOOP must be used.
So, instead of writing
openCommand("Add horizontal constraint"); it could be openCommand(QT_TRANSLATE_NOOP("Command", "Add horizontal constraint"));

Then in the undo/redo dialog class the string must be translated with qApp->translate("Command", text)

Important is that the context string "Command" is used everywhere because otherwise not all strings will be translated.

[luzpaz]

Thanks wmayer 😀
For posterity, tracking this issue (translating openCommand()") in https://tracker.freecadweb.org/view.php?id=4473