Update cs.po

Updated cs translation.
Handle cases where a forecast item is null.

Fixes #153.
Merge pull request #151 from psimacek/patch-2

Updated cs.po
Merge pull request #155 from foghina/master

Handle cases where a forecast item is null.
Add GNOME Shell 3.10 support in metadata.json
First step to 3.10, need to kill a margin in forecast box
Full compat 3.8/3.10
Center condition text
Merge pull request #156 from Neroth/beta

GNOME Shell 3.10 compat
Update stylesheet.css

Forget to delete debug border
Minor fix to French translation