MozStumbler v0.19.0

• Initial Greek translation (@ppapadeas, @johngian, Dimitris Papadopoulos)
• Added Lenovo P780 wifi hotspot to blocked list (@vinitraje)
• Updated Marathi & Hindi translation (@vinitraje)
• Add more on-vehicle SSIDs to the block list (@Rondom)
• Added some Norwegian transport SSIDs (@JensErat)
• Update zh-CN translation (@l-hedgehog)
• Change Intent string into more "Android" way (@tamcap)
• Update Hebrew translation (@yarons)
• Update Polish translation (@piotrdrag)