Index: src/includes/forums/functions.php
===================================================================
--- src/includes/forums/functions.php	(revision 7009)
+++ src/includes/forums/functions.php	(working copy)
@@ -590,7 +590,7 @@
 
 	} else {
 		$append_error = ( is_wp_error( $forum_id ) && $forum_id->get_error_message() ) ? $forum_id->get_error_message() . ' ' : '';
-		bbp_add_error( 'bbp_forum_error', __( '<strong>ERROR</strong>: The following problem(s) have been found with your forum:' . $append_error . 'Please try again.', 'bbpress' ) );
+		bbp_add_error( 'bbp_forum_error', sprintf( __( '<strong>ERROR</strong>: The following problem(s) have been found with your forum: %s Please try again.', 'bbpress' ), trim( $append_error ) ) );
 	}
 }

Index: src/includes/replies/functions.php
===================================================================
--- src/includes/replies/functions.php	(revision 7009)
+++ src/includes/replies/functions.php	(working copy)
@@ -766,7 +766,7 @@
 
 	} else {
 		$append_error = ( is_wp_error( $reply_id ) && $reply_id->get_error_message() ) ? $reply_id->get_error_message() . ' ' : '';
-		bbp_add_error( 'bbp_reply_error', __( '<strong>ERROR</strong>: The following problem(s) have been found with your reply:' . $append_error . 'Please try again.', 'bbpress' ) );
+		bbp_add_error( 'bbp_reply_error', sprintf( __( '<strong>ERROR</strong>: The following problem(s) have been found with your reply: %s Please try again.', 'bbpress' ), trim( $append_error ) );
 	}
 }
 
Index: src/includes/topics/functions.php
===================================================================
--- src/includes/topics/functions.php	(revision 7009)
+++ src/includes/topics/functions.php	(working copy)
@@ -713,7 +713,7 @@
 
 	} else {
 		$append_error = ( is_wp_error( $topic_id ) && $topic_id->get_error_message() ) ? $topic_id->get_error_message() . ' ' : '';
-		bbp_add_error( 'bbp_topic_error', __( '<strong>ERROR</strong>: The following problem(s) have been found with your topic:' . $append_error . 'Please try again.', 'bbpress' ) );
+		bbp_add_error( 'bbp_topic_error', sprintf( __( '<strong>ERROR</strong>: The following problem(s) have been found with your topic: %s Please try again.', 'bbpress' ), trim( $append_error ) ) );
 	}
 }