Revert r40953 '(bug 7509) Don't hardcode separation strings, make them configurable'

Revert r40953 '(bug 7509) Don't hardcode separation strings, make them configurable'

This seems to make code much uglier and harder to maintain -- there are a bajillion new calls to "wfMsgExt( 'pipe-separator' , 'escapenoentities' )" which is not trivial or easy to remember. This makes code uglier, harder to read, harder to maintain, and more prone to error.