diff --git a/lang/en/xmldb.php b/lang/en/xmldb.php
index 6b01d4e..9c5328a 100644
--- a/lang/en/xmldb.php
+++ b/lang/en/xmldb.php
@@ -66,7 +66,10 @@ $string['documentationintro'] = 'This documentation is generated automatically f
 $string['down'] = 'Down';
 $string['duplicate'] = 'Duplicate';
 $string['duplicatefieldname'] = 'Another field with that name exists';
+$string['duplicatefieldsused'] = 'You have specified the same reference fields more than once.';
 $string['duplicatekeyname'] = 'Another key with that name exists';
+$string['duplicateindexname'] = 'Another index with the same name exists';
+$string['duplicatetablename'] = 'Another table with the same name exists';
 $string['edit'] = 'Edit';
 $string['edit_field'] = 'Edit field';
 $string['edit_field_save'] = 'Save field';
@@ -85,6 +88,7 @@ $string['fieldnameempty'] = 'Name field empty';
 $string['fields'] = 'Fields';
 $string['fieldsnotintable'] = 'Field doesn\'t exist in table';
 $string['fieldsusedinkey'] = 'This field is used as key.';
+$string['fieldsusedinindex'] = 'This field is used in an index.';
 $string['filenotwriteable'] = 'File not writeable';
 $string['fkviolationdetails'] = 'Foreign key {$a->keyname} on table {$a->tablename} is violated by {$a->numviolations} out of {$a->numrows} rows.';
 $string['floatincorrectdecimals'] = 'Incorrect number of decimals for float field';
@@ -104,11 +108,16 @@ $string['check_foreign_keys'] = 'Look for foreign key violations';
 $string['checkindexes'] = 'Check indexes';
 $string['check_indexes'] = 'Look for missing DB indexes';
 $string['incorrectfieldname'] = 'Incorrect name';
+$string['incorrectkeyname'] = 'Incorrect key name';
+$string['incorrectindexname'] = 'Incorrect index name';
+$string['incorrecttablename'] = 'Incorrect table name';
 $string['index'] = 'Index';
 $string['indexes'] = 'Indexes';
+$string['indexnameempty'] = 'You must enter a name for the index';
 $string['integerincorrectlength'] = 'Incorrect length for integer field';
 $string['key'] = 'Key';
 $string['keys'] = 'Keys';
+$string['keynameempty'] = 'You must provide a name for the key.';
 $string['listreservedwords'] = 'List of Reserved Words<br />(used to keep <a href="http://docs.moodle.org/en/XMLDB_reserved_words" target="_blank">XMLDB_reserved_words</a> updated)';
 $string['load'] = 'Load';
 $string['main_view'] = 'Main view';
@@ -125,8 +134,11 @@ $string['newkey'] = 'New key';
 $string['newtable'] = 'New table';
 $string['newtablefrommysql'] = 'New table from MySQL';
 $string['new_table_from_mysql'] = 'New table from MySQL';
+$string['nofieldsspecified'] = 'You must specify a field for this key to relate to on this table.';
 $string['nomasterprimaryuniquefound'] = 'The column(s) that you foreign key references must be included in a primary or unique KEY in the referenced table. Note, the column being in a UNIQUE INDEX is not good enough.';
 $string['nomissingindexesfound'] = 'No missing indexes have been found, your DB doesn\'t need further actions.';
+$string['noreffieldsspecified'] = 'You must specify one of more reference fields.';
+$string['noreftablespecified'] = 'You must specify a reference table for this key.';
 $string['noviolatedforeignkeysfound'] = 'No violated foreign keys found';
 $string['nowrongdefaultsfound'] = 'No inconsistent default values have been found, your DB does not need further actions.';
 $string['nowrongintsfound'] = 'No wrong integers have been found, your DB doesn\'t need further actions.';
@@ -135,6 +147,7 @@ $string['numberincorrectlength'] = 'Incorrect length for number field';
 $string['pendingchanges'] = 'Note: You have performed changes to this file. They can be saved at any moment.';
 $string['pendingchangescannotbesaved'] = 'There are changes in this file but they cannot be saved! Please verify that both the directory and the "install.xml" within it have write permissions for the web server.';
 $string['pendingchangescannotbesavedreload'] = 'There are changes in this file but they cannot be saved! Please verify that both the directory and the "install.xml" within it have write permissions for the web server. Then reload this page and you should be able to save those changes.';
+$string['primarykeyonlyallownotnullfields'] = 'A primary key field must not allow null values.';
 $string['reserved'] = 'Reserved';
 $string['reservedwords'] = 'Reserved words';
 $string['revert'] = 'Revert';
@@ -149,6 +162,7 @@ $string['selectonefieldkeyindex'] = 'Please select one field/key/index from the
 $string['selecttable'] = 'Select table:';
 $string['table'] = 'Table';
 $string['tables'] = 'Tables';
+$string['tablenameempty'] = 'You must enter a table name';
 $string['textincorrectlength'] = 'Incorrect length for text field';
 $string['unload'] = 'Unload';
 $string['up'] = 'Up';
@@ -170,6 +184,7 @@ $string['wrong'] = 'Wrong';
 $string['wrongdefaults'] = 'Wrong defaults found';
 $string['wrongints'] = 'Wrong integers found';
 $string['wronglengthforenum'] = 'Incorrect length for enum field';
+$string['wrongnumberofreffields'] = 'You must specify one of more reference fields.';
 $string['wrongreservedwords'] = 'Currently used reserved words<br />(note that table names aren\'t important if using $CFG->prefix)';
 $string['yesmissingindexesfound'] = 'Some missing indexes have been found in your DB. Here are their details and the needed SQL statements to be executed with your favourite SQL interface to create all them (don\'t forget to backup your data before doing that).<br /><br />After doing that, it\'s highly recommended to execute this utility again to check that no more missing indexes are found.';
 $string['yeswrongdefaultsfound'] = 'Some inconsistent defaults have been found in your DB. Here are their details and the needed SQL statements to be executed with your favourite SQL interface to fix them all (don\'t forget to backup your data before doing that).<br /><br />After doing that, it\'s highly recommended to execute this utility again to check that no more inconsistent defaults are found.';