[askrover_standalone] [DEV-1954] Add settings for user-facing name of tags.
[askrover_standalone] [DEV-1954] Change verbose_name and verbose_name_plural of Tag to match settings.
[askrover_standalone] [DEV-1954] Update search to take [keyword:] instead of [tag:].
[askrover_standalone] [DEV-1954] Change use of "tag" in templates to draw from settings.
[askrover_standalone] [DEV-1954] Replace uses of 'tag' with setting in Python code.
[askrover_standalone] [DEV-1954] Wrap settings access in const in functions to prevent circular import.
[askrover_standalone] [DEV-1954] Avoid revolting circular import by hard-coding 'keyword' in const.
[askrover_standalone] [DEV-1953] Change "Ask Rover" to "Rover Community Q&A."
[askrover_standalone] [DEV-1953] Change "Ask Rover" to "Rover Community Q&A" in the footer. (No action -footer has been deleted (from cherry-pick).)

Conflicts:
	askbot/skins/rover_skin/templates/rover_assets/footer.html