Drupal: Set bts() context for "Home" preference set

Designating a translation context allows this string to have a different translation than the "Home" menu

https://dev.gridrepublic.org/browse/DBOINCP-222

drupal/sites/default/boinc/modules/boincwork/boincwork.module

@@ -387,7 +387,7 @@ function generalprefs_page($action = null, $venue = null, $advanced = FALSE) {
       $path = 'account/prefs/computing/edit';
       $venues = array(
         "{$path}/generic" => bts('Generic'),
-        "{$path}/home" => bts('Home'),
+        "{$path}/home" => bts('Home', array(), NULL, 'boinc:preference set'),
         "{$path}/work" => bts('Work'),
         "{$path}/school" => bts('School')
       );