Various small tweaks intended with memory management in mind.
Use APIBaseURL instead of hardcoded address whenever possible.
Increase timeout value to 60 seconds.

http://forums.cocoaforge.com/viewtopic.php?t=26167&p=136680
Fix an omission in french translation
Fix problems in french version of Info window

(Inversion in SNDisclosableView arrows, and truncated labels)
Need to increase timeout with Facebook again

I hope 180 seconds is enough...
Workaround for issue #166 : plugins opening an URL operate in a new, foreground tab.
Less ambiguous translation of feed "validate" in French ("Vérifier" instead of "valider")
Detect authentication failure
Leopard (Safari < 5.1) does not support the box-sizing CSS property ; for similar effect, it requires the -webkit-box-sizing property
Align the Tyger Graphite style with the Default style (use gradient image).
Check if we are ready before a feed refresh ; detect obsolete token after feed refresh.
Workaround for Macintosh wake up after a sleep : the NSTimers used for tracking the lifetime of Google's tokens were out of touch after sleep.
Make sure articles will not mix.
Added a vertically centered NSTextFieldCell subclass.

Class inspired by http://www.red-sweater.com/blog/148/what-a-difference-a-cell-makes and http://stackoverflow.com/questions/1235219/is-there-a-right-way-to-have-nstextfieldcell-draw-vertically-centered-text
Use vertically centered text cell for the progress cell.

Related to issue #174
Use also vertically centered cells for other columns of article list.

Issue #174
Merge pull request #172 from barijaona/bugfixes