Implemented "goto subscription".

TODO:
 * Neither navigation with arrows nor selection with ENTER implemented,
   must click a subscription.
refactored flatten to use new traverse function
move style to appropriate file
refactored dialog
fix i18n generation script
new labels
missing semicolons
since push info is fetched lazily anyway, get it with the join
not needed for count
Update pl.properties
Merge pull request #223 from tuwxyz/patch-1

Update pl.properties
switch blocks position
New labels for portuguese translation.
Updated Hungarian translation
Merge pull request #226 from gabrielrcp/translation

New labels for portuguese translation.
Merge pull request #227 from evenorbert/patch-1

Updated Hungarian translation
Update gl.properties

new tags
Merge pull request #229 from xmgz/patch-3

Update gl.properties
Translated new labels to Swedish

Every day I'm translatin'.
Merge pull request #230 from LpSamuelm/patch-9

Translated new labels to Swedish