UTF-8 encoding bug on PHP older than 5.4

In PHP older than 5.4.0, the default charset for htmlspecialchars() and
html_entity_decode() was ISO-8859-1, which created erroneous UTF-8
characters
Big area mark as read

Added a big area to mark all as read below the list of articles
New option onread_jump_next

Added a new option to automatically jump to the next sibling (category
or feed) when hitting the button "mark as read".
Merge remote-tracking branch 'origin/onread_jump_next' into dev
Merge remote-tracking branch 'origin/utf8bug' into dev