Merge pull request #60 from RaphaelRochet/master

French translation update
Update Japanese translation for recently added strings.
Merge pull request #61 from takobayashi/translate-jp

Update Japanese translation for recently added strings.
force login when starting in shortcut mode to prevent blank fragments
add open article in web browser to headline context menu
fix catchup_above to behave as the desktop version (not including
selected article)
tweak typography and layouts a bit
article fragment: fix wrong padding
remove sans-serif-condensed
adjust other relevant element sizes in headline and article views based
on user setting
add option for condensed fonts
use line-spacing on headlines; increase default line-height on articles
a bit
French translation : Added 'Open in web browser'