Adding two missing strings. MDL-6017

NOTE: These are OUT for Moodle 1.9 and new Grade System, so don't
      translate them!

lang/en_utf8/grades.php

@@ -8,6 +8,7 @@ $string['addexceptionerror'] = 'Error occurred while adding exception for userid
 $string['allgrades'] = 'All grades by category';
 $string['allstudents'] = 'All Students';
 $string['average'] = 'Average';
+$string['backupwithoutgradebook'] = 'Backup do not contain Gradebook configuration';
 $string['bonuspoints'] = 'Bonus Points';
 $string['categories'] = 'Categories';
 $string['category'] = 'Category';
@@ -88,6 +89,7 @@ $string['pointsdescending'] = 'Sort by points descdending';
 $string['preferences'] = 'Preferences';
 $string['rawpct'] = 'Raw %%';
 $string['reprintheaders'] = 'Reprint Headers';
+$string['respectingcurrentdata'] = 'leaving current configuration unmodified';
 $string['savechanges'] = 'Save Changes';
 $string['savepreferences'] = 'Save Preferences';
 $string['scaledpct'] = 'Scaled %%';