HTML: Use <p> and <br> instead of <table>

To avoid the hover effect use <p> in combination with <br/>.
Removed some <p>'s, h3 instead of strong
Removed duplicate information in HTML

Removed duplicate and needless information from settings and admin
template.
Merge pull request #93 from owncloud/html_dont_use_tables

HTML: Use <p> and <br> instead of <table>, template design improvements