For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Please see our announcement here.
/** 1.0.7 **/
define("_ONE2ONE", "One To One");
define("_LINKS_TO_THIS_TABLE_LONG", "For each of the tables checked below, a new column " .
"will appear in this table linking through to that table's view." .
"The second table's data will be filtered on the first table's record<br />") .
"For each of the forms checked below, a new column will appear in this table linking to that tables form." .
"If 'One To One'\ is selected, this link will edit or create a single associated row." .
"If not checked, this link will always create a new linked row."