Comment 1 for bug 560751

> Whatever the standard would be, usage of the colon should be generalised.

The gnome HIG (http://library.gnome.org/devel/hig-book/stable/) is not very clear about it, but I think that we should do the opposite and ban colons in group headers (Gimp and Scribus don't use colons).

There are other punctuation inconsistencies in Inkscape:
1. Period at the end of the tooltips (not sure what's right here).
2. Missing colon after labels.
3. Incorrect period at the end of labels (checkboxes or radio buttons).

And the preferences dialog is very clean compared to the extensions dialogs...