Suggestions for ManageThemes

Removed some colons, <tt> tag (not html 5 compliant), add help to h bar,
changed some titles, changed wording in help/boxes to better clarify
purpose of Manage and Install section. Could remove helps from top two h
bars, redundant info.
Merge pull request #1562 from Aggelos777/master

Suggestions for ManageThemes
A bit of padding for our (small)descriptions?
More options for styling descriptions in lists

Signed-off-by: emanuele <emanuele45@gmail.com>
Adding back ftp tag because there are several places it is mentioned and somehow parsed it is not worth at that point to dig them out (I think)

Signed-off-by: emanuele <emanuele45@gmail.com>
This string is no longer needed

Signed-off-by: emanuele <emanuele45@gmail.com>