CampSite 2017: Rename mobile menu labels to "Menu"

[melchoyce]

Currently on mobile, the menus are labelled by their positions — which doesn't make sense for site viewers, who don't have any context around menu locations. We should relabel them "Menu."

[iandunn]

FTR that's ​https://2018.boston.wordcamp.org/ using the CampSite-2017 theme.

I agree that it shouldn't have "secondary" or other location labels in it.

[iandunn]

Although, the primary and secondary menus are pretty close to each other, so if they're both used, then the user might be confused about whether or not they're the same, and which one contains the items they're looking for. I'm not sure if there's a better solution, though, because "primary" and "secondary" won't really give the user the information they need in that case either.

[melchoyce]

Could we use the user-defined menu names? Then it's up to the camp to come up with something that makes the most sense based on their content.

[ryelle]

3598.patch​ uses the menu name set for the given location, so WC organizers can name the menus themselves (so if Secondary was social links, it can be called that, etc).

[vedjain]

In 8747:

WC Campsite2017: Use menu names to make it more useful for visitors

Earlier, on mobile, menus were labelled by their positions, i.e. Primary or Secondary, which does not really makes sense for a visitor.
This patch uses the actual menu names to label a menu, so that organizers can come up with names that makes most sense depending upon content, for egs, Socials, Pages etc.

fixes #3598
props ryelle