Translate wifi_scan_always_* and Wi-Fi

Apply Fundeu foundation recomendation to translate Wi-Fi by wifi
http://www.fundeu.es/recomendacion/wifi-como-termino-espanol-545/
add russian translation
type
Add cell data to the lookup requests in MapActivity

Partially-Fixes #354.
Merge pull request #498 from stripTM/patch-5

Update Spanish translation (@stripTM)
Merge pull request #499 from CupIvan/patch-2

Update Russian translation (@CupIvan)
Add Wi-Fi scanner status [#302]
Check GPS only when start scan clicked [#494]
Merge pull request #492 from illarionov/wifiStatus

AddWi-Fi scanner status [fix #302] (@illarionov)
Merge pull request #500 from illarionov/fixCheckGps

Check GPS only when start scan clicked [fix #494] (@illarionov)
Add "Scan AP's even when Wi-FI is off" [#32]
values-es (@stripTM)
Synch. german translation with the latest english version.
Update spanish strings
Updated German translation
Update strings.xml
Merge pull request #504 from romankl/de-translation

Update German translation (@romankl and @Djfe)
Merge pull request #508 from rodmoreno/master

Update Spanish strings (@rodmoreno and @stripTM)
Merge pull request #501 from tamcap/send_cell_data

Add cell data to the lookup requests in MapActivity (@tamcap)
Merge pull request #493 from illarionov/wifiScanAlways

Add "Scan AP's even when Wi-FI is off" setting [fix #32] (@illarionov)