Fix preg_match

Author: swissspidy

src/Core_Language_Command.php

@@ -293,7 +293,7 @@ public function uninstall( $args, $assoc_args ) {
 
 				if (
 					! in_array( $file, $files_to_remove, true ) &&
-					! preg_match( "$language_code-\w{32}\.json", $file )
+					! preg_match( "/$language_code-\w{32}\.json/", $file )
 				) {
 					continue;
 				}

src/Plugin_Language_Command.php

@@ -491,7 +491,7 @@ public function uninstall( $args, $assoc_args ) {
 
 					if (
 						! in_array( $file, $files_to_remove, true ) &&
-						! preg_match( "$plugin-$language_code-\w{32}\.json", $file )
+						! preg_match( "/$plugin-$language_code-\w{32}\.json/", $file )
 					) {
 						continue;
 					}

src/Theme_Language_Command.php

@@ -502,7 +502,7 @@ public function uninstall( $args, $assoc_args ) {
 
 					if (
 						! in_array( $file, $files_to_remove, true ) &&
-						! preg_match( "$theme-$language_code-\w{32}\.json", $file )
+						! preg_match( "/$theme-$language_code-\w{32}\.json/", $file )
 					) {
 						continue;
 					}