Better wording when installing an extension with the Extension Manager

It currently says something like: "Applying INSTALL for extension [XWiki Commons - Extension - Repository - XWiki model 4.1.3] on namespace [wiki:xwiki]".

It would better to phrase it like this (more user-friendly):
"Installing the [XWiki Commons - Extension - Repository - XWiki model 4.1.3] extension..." (for the main wiki) or "Installing the [XWiki Commons - Extension - Repository - XWiki model 4.1.3] extension in the [somewiki] wiki..." (when installing in a subwiki).