r.info: Rename location to project in outputs

[wenzeslaus]

• Translatable plain text output now generates "Project" instead of "Location".
• Extended shell-style output now generates "project=" in addtion to "location=".
• Shell example in documentation now shows project only.
• Words "data base location and mapset" in documentation are now replaced by a slightly experimental "project, mapset, project parent directory (database directory)". The order is what works best for the sentence. The print order is mapset, project, directory.