MDL-21250 capital letters removal and greylisted string removal

lang/en/error.php

@@ -253,7 +253,7 @@
 $string['invalidaccess'] = 'This page was not accessed correctly';
 $string['invalidaccessparameter'] = 'Invalid access parameter';
 $string['invalidaction'] = 'Invalid action parameter';
-$string['invalidactivityid'] = 'Invalid Activity ID';
+$string['invalidactivityid'] = 'Invalid activity ID';
 $string['invalidadminsettingname'] = 'Invalid admin setting ({$a})';
 $string['invalidargorconf'] = 'No valid arguments supplied or incorrect server configuration';
 $string['invalidarguments'] = 'No valid arguments supplied';
@@ -276,7 +276,7 @@
 $string['invalidfieldname'] = '"{$a}" is not a valid field name';
 $string['invalidfiletype'] = '"{$a}" is not a valid file type';
 $string['invalidformatpara'] = 'Incorrect format for choose parameter';
-$string['invalidformdata'] = 'Incorrect Form Data';
+$string['invalidformdata'] = 'Incorrect form data';
 $string['invalidfunction'] = 'Incorrect function';
 $string['invalidgradeitmeid'] = 'Incorrect grade item id';
 $string['invalidgroupid'] = 'Incorrect group id specified';
@@ -458,7 +458,7 @@
 $string['unknownblockregion'] = 'The block region \'{$a}\' is not recognised on this page.';
 $string['unknowncontext'] = 'This is an unknown context.';
 $string['unknowncourse'] = 'Unknown course named "{$a}"';
-$string['unknowncourseidnumber'] = 'Unknown Course ID "{$a}"';
+$string['unknowncourseidnumber'] = 'Unknown course ID "{$a}"';
 $string['unknowncourserequest'] = 'Unknown course request';
 $string['unknownfiletype'] = 'Error unknown filtertype';
 $string['unknowngroup'] = 'Unknown group "{$a}"';
@@ -516,4 +516,3 @@
 $string['xmldberror'] = 'XMLDB error!';
 $string['alreadyloggedin'] = 'You are already logged in as {$a}, you need to log out before logging is as different user.';
 $string['youcannotdeletecategory'] = 'You cannot delete category \'{$a}\' because you can neither delete the contents, nor move them elsewhere.';
-$string['younotteacher'] = 'You are not a teacher!';