Fix casing on link's textToDisplay field

[kingdomlevel]

This should be merged and deployed simultaneously with the appropriate updates in the front end

This will require manual DB change, due to the case insensitive nature of MySQL. I've done this locally to test and have the commands ready to go on the deployed instance:

ALTER TABLE components_common_links CHANGE TextToDisplay tempLink varchar(255);
ALTER TABLE components_common_links CHANGE tempLink textToDisplay varchar(255);

This PR:

• fixes casing on all link component's 'text to display' field (previously Pascal case TextToDisplay, now camel case textToDisplay)

(cherry picked from commit 88eb913)