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
Merge pull request #498 from stripTM/patch-5

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

Update Russian translation (@CupIvan)