Jetpack-mu-wpcom plugin banner - update copies (#39725)

* update banner copies

* add changelog entry

* update changelog with correct page name

* enable fallback translations

* ensure jetpack-mu-wpcom domain for translation check

projects/packages/jetpack-mu-wpcom/changelog/update-plugins-banner-copies

@@ -0,0 +1,4 @@
+Significance: minor
+Type: changed
+
+Updated copies used in the plugins banner for wpcom sites plugin-install.php page.

projects/packages/jetpack-mu-wpcom/src/features/wpcom-plugins/wpcom-plugins.php

@@ -24,6 +24,34 @@ function wpcom_plugins_show_banner() {
 
 	$asset_file = include Jetpack_Mu_Wpcom::BASE_DIR . 'build/wpcom-plugins-banner/wpcom-plugins-banner.asset.php';
 
+	/**
+	 * Check to see if a string has been translated. This is for the purposes of changing the banner
+	 * copies below, this function and checks can be removed after new copies are translated.
+	 *
+	 * @param string $string The string to check.
+	 * @return bool True if the string has been translated, false otherwise.
+	 */
+	function should_use_new_translation( $string ) { // phpcs:ignore MediaWiki.Usage.NestedFunctions.NestedFunction
+		if ( function_exists( 'wpcom_launchpad_has_translation' ) ) {
+			return wpcom_launchpad_has_translation( $string, 'jetpack-mu-wpcom' );
+		}
+		// If that function no longer exists in this context, we can assume the new strings have
+		// been translated by now.
+		return true;
+	}
+
+	$banner_title = should_use_new_translation( 'Unlock more with premium and free plugins' ) ?
+		esc_html__( 'Unlock more with premium and free plugins', 'jetpack-mu-wpcom' ) :
+		esc_html__( "Flex your site's features with plugins", 'jetpack-mu-wpcom' );
+
+	$banner_description = should_use_new_translation( "Discover a curated selection of free and premium plugins designed to enhance your site's functionality and features." ) ?
+		esc_html__( "Discover a curated selection of free and premium plugins designed to enhance your site's functionality and features.", 'jetpack-mu-wpcom' ) :
+		esc_html__( "Access a variety of free and paid plugins that can enhance your site's functionality and features.", 'jetpack-mu-wpcom' );
+
+	$banner_cta = should_use_new_translation( 'Explore marketplace plugins' ) ?
+		esc_html__( 'Explore marketplace plugins', 'jetpack-mu-wpcom' ) :
+		esc_html__( 'Explore plugins', 'jetpack-mu-wpcom' );
+
 	wp_enqueue_script(
 		'wpcom-plugins-banner',
 		plugins_url( 'build/wpcom-plugins-banner/wpcom-plugins-banner.js', Jetpack_Mu_Wpcom::BASE_FILE ),
@@ -39,10 +67,10 @@ function wpcom_plugins_show_banner() {
 		'wpcomPluginsBanner',
 		array(
 			'logo'             => esc_url( $wpcom_logo ),
-			'title'            => esc_html__( "Flex your site's features with plugins", 'jetpack-mu-wpcom' ),
-			'description'      => esc_html__( "Access a variety of free and paid plugins that can enhance your site's functionality and features.", 'jetpack-mu-wpcom' ),
+			'title'            => $banner_title,
+			'description'      => $banner_description,
 			'actionUrl'        => esc_url( "https://wordpress.com/plugins/$site_slug?ref=woa-plugin-banner" ),
-			'actionText'       => esc_html__( 'Explore plugins', 'jetpack-mu-wpcom' ),
+			'actionText'       => $banner_cta,
 			'bannerBackground' => esc_url( $background_image ),
 		)
 	);