Explain access levels. Prevent module actions outside of a user's access level.

[FrenjaminBanklin]

See #1983.

#1997 adds the ability to grant any of three different levels of access to a module. The dashboard correctly interprets the current level of access a user has to any given module at the time of the page loading - however, if a user loads the page and their access level is changed before they load the page again, they are still able to interact with the module based on their previous level of access.

For example: User A previously granted 'Full' access to User B for Module X. User B visits their dashboard and can see Module X. User A changes User B's access to 'Partial' or even 'Minimal', but User B has not refreshed their dashboard. Despite now having non-'Full' access to Module X, User B is still able to manage Module X as though they have 'Full' access - including editing, deleting, or changing other users' access levels.

The differences between each access level are also not apparent to the user setting the levels. This could be solved either with some kind of succinct explanatory text in the Share dialog or perhaps a tooltip.