Changed English verbiage and 'About' text/links

* Improved English translation of preferences and strings in UI
* Updated 'About' with new website URLs for osmo.mobi (was osmodroid.com)
* Removed "Manual monitoring: http://esya.ru/om/start/" (because I did not find a new URL to link to)

Signed-off-by: Randy Schnedler <randypower@oscar.local>