chore: typo in error message

Author: fxjordan

reqbaz/src/main/resources/i18n/Translation_en.properties

@@ -51,7 +51,7 @@ error.unknown_exception=%s Error in %s\: %s ExceptionCode\: %d.
 category.uncategorized.Name=General Requirements
 category.uncategorized.Description=Requirements which do not belong to any category.
 error.validation=On %s constraint violation has been detected, because you sent %s and the problem is\: %s.
-error.validation.project_member.already_exists=The use is already a member of this project.
+error.validation.project_member.already_exists=The user is already a member of this project.
 error.authorization.project.read=You do not have rights to read this project.
 error.authorization.project.modify=You do not have rights to modify this project.
 error.authorization.requirement.modify=Only the creator can modify requirements.