Presentational tidy up, verbosity on removing `setup`

Fixed missing `<code>` tags with appropriate alignment for `rtl`
languages on filenames.

Also did a handful of uniformity tweaks on the English files, and made
the text for removing `textpattern/setup` after install more clear
(English only at this stage).
Merge pull request #45 from petecooper/master

Presentational tidy up, verbosity on removing `setup`