HTML Cleanup

Remove line breaks and indentation around links text: At least Chrome/Firefox on
Windows add the white space(s) from the HTML Code to the link text, which
results in "jumping" labels. The behaviour can be observed with the Hello Theme
while toggling the bookmark status.
remove abandoned file

The file confirm_disable_feed isn't used anymore and the action disable-feed
does't exists.
Hello Theme: do not depend on language specific labels