fix(web): add missing tooltips for expand/reduce buttons

UI/Common/English.lproj/Localizable.strings

@@ -41,6 +41,8 @@
      = "Potentially anyone on the Internet will be able to access your address book \"%{0}\", even if they do not have an account on this system. Is this information suitable for the public Internet?";
 "Give Access" = "Give Access";
 "Keep Private" = "Keep Private";
+"Expand" = "Expand";
+"Reduce" = "Reduce";
 
 /* generic.js */
 "Unable to subscribe to that folder!"