I18n: Fix broken loop in WP_Theme_JSON_Resolver

Related issue in Gutenberg: WordPress/gutenberg#33552.

The loop in `WP_Theme_JSON_Resolver` to extract translatable paths was broken, as it contained an immediate and unconditional return. This caused the loop to immediately exit again after the first iteration, thus never actually looping.

Follow-up to [50959].

Props schlessera.
Merges [51472] to the 5.8 branch.
Fixes #53738.

git-svn-id: https://develop.svn.wordpress.org/branches/5.8@51515 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-theme-json-resolver.php

@@ -121,14 +121,13 @@ private static function extract_paths_to_translate( $i18n_partial, $current_path
 		foreach ( $i18n_partial as $property => $partial_child ) {
 			if ( is_numeric( $property ) ) {
 				foreach ( $partial_child as $key => $context ) {
-					return array(
-						array(
-							'path'    => $current_path,
-							'key'     => $key,
-							'context' => $context,
-						),
+					$result[] = array(
+						'path'    => $current_path,
+						'key'     => $key,
+						'context' => $context,
 					);
 				}
+				return $result;
 			}
 			$result = array_merge(
 				$result,