Require Jinja2 < 2.7 for Python 2.5

Jinja2 is a requirement of Sphinx (used to build documentation), but the
latest (2.7) version requires Python 2.6; allow build to succeed by
installing older 2.6 version before processing requirements
Propagate failure status through |tail

This restores proper failure detection broken in earlier commit titled
"Reduce volume of Travis build output"
Add note about Jinja2 and Python 2.5
Move release instructions into the docs/ dir
Add a release date
Fix date range for docs

Looked at wiki dates but also found the origianl 2004-12 release
announcement.  So lets just set 2004 as the start date.
Move release notes into the docs/
Add release notes for 2.5.0 final
Update releasable languages

Serbian, Arabic, Romainian, Ukranian, Danish, Dutch, English (South
African), Scots Gaelic, Slovenian
Update translations for unreleased languages
Fix lang=
Various update to release notes
Really get rid of that Greek that arrived in English
Minor fixes to rST in docs/
Minor releaseing doc update
Typos in 2.5.0 release notes
Make some attempt to get sourceforge username
Fold back fixes from gh-pages into release notes

Yes I know these are historic, but they are also currently readable in
our docs. So lets make them read correctly.
Adapt publish-sourceforge to new release note location
Renamed to `Regular Pages` to avoid name confusions