Fix bug #2114 and fix Open Street Map sp in i18n message

[filbertkm]

These changes:

1. fix the spelling of Open Street Maps -> OpenStreetMap in the map_provider_description i18n (en) message that appears on the advanced map installer page.
2. fix bug #2114 -- on the admin/settings map tab, the country dropdown list overflows the right column on smaller screens. Changed substr param from 35 to 30 which fixes this.

[filbertkm]

3. fixed a bug with the timezones. my timezone was somehow set to 12 -- a number and not a string. date_default_timezone_set requires a string, so I got an error that the timezone was invalid. Adding this check, fixed this and allowed me to go back to the settings page and set the timezone. There might be a better way, but this worked.

[rjmackay]

Hi Katie,
Sorry this has been ignored for so long. Your patch is now out of date and I suspect fixed already. If you think there's still an issue, could you update your code and resubmit? Thanks
Robbie