Changed string to make it more general so we can use it for error mes…

…sage that

is shown when a student tries to add an entry and no fields are defined.

lang/en_utf8/data.php

@@ -104,7 +104,7 @@
 $string['nameurl'] = 'URL field';
 $string['newentry'] = 'New entry';
 $string['newfield'] = 'Create a new field';
-$string['nofieldindatabase'] = 'There are no fields defined for this database, please add some';
+$string['nofieldindatabase'] = 'There are no fields defined for this database.';
 $string['nolisttemplate'] = 'List template is not yet defined';
 $string['nosingletemplate'] = 'Single template is not yet defined';
 $string['nomaximum'] = 'No maximum';