Lang string fixes for "Watchlist" help files (Bug 892959)

The lang strings for the watchlist needed to be
updated as there is no watchlist for groups and
journals. I also alphabetized the strings in the
help file for the inbox.

Change-Id: I61c959a2fe79081983832b6d0238acc3cb54d63e
Signed-off-by: Kristina D.C. Hoeppner <kristina@catalyst.net.nz>
Merge "Lang string fixes for "Watchlist" help files (Bug 892959)"