Added Survey back button, with option to turn it on/off, tests, and i18n

Noticed that some Survey tests are broken, will fix tomorrow

docs/changelog/7.x.x.txt

@@ -34,6 +34,7 @@
  - added: ThingyRecord allows you to sell records in a Thingy (like a classified ad)
  - fixed: #10109: Matrix 2.0 - Updates to product listing by maintainer account require admin approval
  - fixed #10146: Thingy duplicate errors
+ - Added Survey back button
 
 7.7.3
  - fixed #10094: double explanation in thread help

docs/upgrades/upgrade_7.7.3-7.7.4.pl

@@ -37,7 +37,7 @@ allMaintenanceSingleton($session);
 unsetPackageFlags($session);
 installThingyRecord( $session );
 installPluggableTax( $session );
-
+addSurveyBackButtonColumn( $session );
 
 finish($session); # this line required
 
@@ -247,6 +247,12 @@ ENDSQL
     print "DONE!\n" unless $quiet;
 }
 
+sub addSurveyBackButtonColumn{
+    my $session = shift;
+    print "\tAdding allowBackBtn column to Survey table... " unless $quiet;
+    $session->db->write("alter table Survey add column `allowBackBtn` TINYINT(3)");
+    print "Done.\n" unless $quiet;
+}
 
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