Added Bengali Translation

Tried to add Bengali translation.
Update strings.xml for bengali localization
fixed spelling mistake and added more translation
Add Taiwan's on-bus/train SSID to Blocklist
Add Catalan translation.
Remove Catalan translation strings backup.
Fixing Catalan Translation
Fix F-Droid builds by downgrading to gradle 1.9
Override scanning button's default ON/OFF text
MozStumbler v0.11.0
sync zh-CN translation with en-US strings
Update strings.xml

Add spanish translation of cells
Cleaning up the layout, optimizing code for the on/off button.
Introducing WiFi only uploading.
Basic geofencing.