Fix to issue #820.

adminui/answertests.php

@@ -76,7 +76,7 @@ $columns = array(
     'passed'        => stack_string('testsuitecolpassed'),
     'studentanswer' => stack_string('studentanswer'),
     'teacheranswer' => stack_string('teacheranswer'),
-    'options'       => stack_string('options'),
+    'options'       => stack_string('options_short'),
     'rawmark'       => stack_string('testsuitecolmark'),
     'error'         => stack_string('testsuitecolerror'),
     'feedback'      => stack_string('testsuitefeedback'),

cli/answertests_docs.php

@@ -49,7 +49,7 @@ foreach ($availabletests as $anstest) {
         'passed'        => stack_string('testsuitecolpassed'),
         'studentanswer' => stack_string('studentanswer'),
         'teacheranswer' => stack_string('teacheranswer'),
-        'options'       => stack_string('options'),
+        'options'       => stack_string('options_short'),
         'rawmark'       => stack_string('testsuitecolmark'),
         'error'         => stack_string('testsuitecolerror'),
         'feedback'      => stack_string('testsuitefeedback'),

lang/en/qtype_stack.php

@@ -643,7 +643,8 @@ $string['answertest_ab'] = 'Test';
 $string['testsuitecolpassed'] = '?';
 $string['studentanswer'] = 'Student response';
 $string['teacheranswer'] = 'Teacher answer';
-$string['options'] = 'Opt';
+$string['options'] = 'Options';
+$string['options_short'] = 'Opt';
 $string['testsuitefeedback'] = 'Feedback';
 $string['testsuitecolerror'] = 'CAS errors';
 $string['testsuitecolmark'] = 'Mark';