added english language files

Because changes are needed these basic language files were added.
renamed language to english_nu and changed some texts

Changed the words 'contact us' and 'powered by'.
Added a value for 'or find us here'
created first folder structure and added template files

Started to add the modified templates. First changes to the master
template files are missing. There were already multiple customizations
made.
significant update to global style

Changed the whole layout to border-box model. Except for the inline
editor.
Introduced border styles to basic elements. Mainly on index and thread
pages.
Handled some overflow issues.
Also cleared the code and switched the order of some properties.
reflected changes to welcomeblock from member to guest

This is not finished yet.