MDL-63730 lang: Merge English strings from the en_fix language pack

Significant string changes:

* withselectedusers_help, core - removing mention of 'Add a common note'
  as the option no longer exists
* considereddigitalminor and digitalminor_desc, core - more
  child-friendly wording
* configmessagingallusers, core_admin - clearer explanation
* auth_dbtype, auth_db - fixed broken link

availability/condition/profile/lang/en/availability_profile.php

@@ -23,7 +23,7 @@
  */
 
 $string['conditiontitle'] = 'User profile field';
-$string['description'] = 'Control access based on fields within the student’s profile.';
+$string['description'] = 'Control access based on fields within the student\'s profile.';
 $string['error_selectfield'] = 'You must select a profile field.';
 $string['error_setvalue'] = 'You must type a value.';
 $string['label_operator'] = 'Method of comparison';
@@ -42,7 +42,7 @@ $string['requires_startswith'] = 'Your <strong>{$a->field}</strong> starts with
 $string['missing'] = '(Missing custom field: {$a})';
 $string['title'] = 'User profile';
 $string['op_contains'] = 'contains';
-$string['op_doesnotcontain'] = 'doesn&rsquo;t contain';
+$string['op_doesnotcontain'] = 'doesn\'t contain';
 $string['op_endswith'] = 'ends with';
 $string['op_isempty'] = 'is empty';
 $string['op_isequalto'] = 'is equal to';