Fix some docs warnings and errors

These came out of "make html".

Change-Id: Iff009879de16bdad806b64e9f6beb64bb9cf6240
Return Integer or Float casted value in NumberParam

Integer value used in parameter, so failed validation in properties.
The solution here is return Integer casted value or Float casted value
as value of NumberParam.

The method of which type choose for cast is same of Property.str_to_num.

Fixes bug #1226494

Change-Id: I9f7d894ffae8a728dce783d5881af3d377268b93
Allow overriding the instance_user per server

I have called the property 'admin_user' as the bug suggests.

Closes-bug: #1229825
Change-Id: I578ba9c0419383b34ac137e714f9cc00fe696ea3
Imported Translations from Transifex

Change-Id: Ie1605371add0b8fca445f993f3a2767a72fbd484
Merge "Fix some docs warnings and errors"
Merge "Allow overriding the instance_user per server"
Merge "Return Integer or Float casted value in NumberParam"
Merge "Imported Translations from Transifex"