Created missing folders

These folders got deleted due to no files being in them and git
therefore discarding them. Unlike loffty's commit at
https://github.com/zpanel/zpanelx/commit/92fec7c50da695a003afae66f476f61b3472691a
I did not deny access to each folder using a .htaccess as the .htaccess
in the root of Roundcube's folder already does this.
Deleted extra div

https://github.com/MathDerVakker/zpanelx/commit/0a5da16fdb1bc471478393425e7b55793f9fc524
Corrected grammar

It's is short for it is or it has.
Its is the possessive form of it.
Merge pull request #2 from jacobg830/master

Very minor bugfixes