Merge pull request #14 from RaphaelRochet/master

French translation
fix typo in preferences
enlarge maximum amount of articles in headline buffer
modify catchup_above to exclude current article for consistency
fix catchup_above to only work on actually unread article (closes #632)
offline: fix catchup_above not respecting oldest first setting; exclude
current article for consistency with tt-rss
offline: fix catchup_above to only process unread articles
bump version