Localisation: the properties dialog adds ':' to strings in a non-localisable way

[Steve Dodier-Lazaro]

Hello,

In xlgui/properties.py, all entry labels are defined on lines 42-76, without the colon, which is then dynamically added at the end of the labels before they're displayed, which forces labels to be of the form "<label name>:".

This is not valid in french as we should have "<label name>" :". It will also probably break with RTL languages such as hebrew and arabic. Thus, I think the colons should be directly added to the labels when they're defined.

[Mathias Brodala (mathbr)]

Fixed with r4032.