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diff --git a/www/wiki/extensions/Translate/ffs/JavaScriptFFS.php b/www/wiki/extensions/Translate/ffs/JavaScriptFFS.php
new file mode 100644
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+++ b/www/wiki/extensions/Translate/ffs/JavaScriptFFS.php
@@ -0,0 +1,286 @@
+<?php
+
+/**
+ * Generic file format support for JavaScript formatted files.
+ * @ingroup FFS
+ */
+abstract class JavaScriptFFS extends SimpleFFS {
+	public function getFileExtensions() {
+		return [ '.js' ];
+	}
+
+	/**
+	 * Message keys format.
+	 *
+	 * @param string $key
+	 *
+	 * @return string
+	 */
+	abstract protected function transformKey( $key );
+
+	/**
+	 * Header of message file.
+	 *
+	 * @param string $code
+	 * @param string[] $authors
+	 */
+	abstract protected function header( $code, array $authors );
+
+	/**
+	 * Footer of message file.
+	 */
+	abstract protected function footer();
+
+	/**
+	 * @param string $data
+	 * @return array Parsed data.
+	 */
+	public function readFromVariable( $data ) {
+		/* Parse authors list */
+		$authors = preg_replace( "#/\* Translators\:\n(.*?)\n \*/(.*)#s", '$1', $data );
+		if ( $authors === $data ) {
+			$authors = [];
+		} else {
+			$authors = explode( "\n", $authors );
+			$count = count( $authors );
+			for ( $i = 0; $i < $count; $i++ ) {
+				// Each line should look like " *  - Translatorname"
+				$authors[$i] = substr( $authors[$i], 6 );
+			}
+		}
+
+		/* Pre-processing of messages */
+
+		/**
+		 * Find the start and end of the data section (enclosed in curly braces).
+		 */
+		$dataStart = strpos( $data, '{' );
+		$dataEnd = strrpos( $data, '}' );
+
+		/**
+		 * Strip everything outside of the data section.
+		 */
+		$data = substr( $data, $dataStart + 1, $dataEnd - $dataStart - 1 );
+
+		/**
+		 * Strip comments.
+		 */
+		$data = preg_replace( '#^(\s*?)//(.*?)$#m', '', $data );
+
+		/**
+		 * Replace message endings with double quotes.
+		 */
+		$data = preg_replace( "#\'\,\n#", "\",\n", $data );
+
+		/**
+		 * Strip excess whitespace.
+		 */
+		$data = trim( $data );
+
+		/**
+		 * Per-key message processing.
+		 */
+
+		/**
+		 * Break in to segments.
+		 */
+		$data = explode( "\",\n", $data );
+
+		$messages = [];
+		foreach ( $data as $segment ) {
+			/**
+			 * Add back trailing quote, removed by explosion.
+			 */
+			$segment .= '"';
+
+			/**
+			 * Concatenate separated strings.
+			 */
+			$segment = str_replace( '"+', '" +', $segment );
+			$segment = explode( '" +', $segment );
+			$count = count( $segment );
+			for ( $i = 0; $i < $count; $i++ ) {
+				$segment[$i] = ltrim( ltrim( $segment[$i] ), '"' );
+			}
+			$segment = implode( $segment );
+
+			/**
+			 * Remove line breaks between message keys and messages.
+			 */
+			$segment = preg_replace( "#\:(\s+)[\\\"\']#", ': "', $segment );
+
+			/**
+			 * Break in to key and message.
+			 */
+			$segments = explode( ': "', $segment );
+
+			/**
+			 * Strip excess whitespace from key and value, then quotation marks.
+			 */
+			$key = trim( trim( $segments[0] ), "'\"" );
+			$value = trim( trim( $segments[1] ), "'\"" );
+
+			/**
+			 * Unescape any JavaScript string syntax and append to message array.
+			 */
+			$messages[$key] = self::unescapeJsString( $value );
+		}
+
+		$messages = $this->group->getMangler()->mangle( $messages );
+
+		return [
+			'AUTHORS' => $authors,
+			'MESSAGES' => $messages
+		];
+	}
+
+	/**
+	 * @param MessageCollection $collection
+	 * @return string
+	 */
+	public function writeReal( MessageCollection $collection ) {
+		$header = $this->header( $collection->code, $collection->getAuthors() );
+
+		$mangler = $this->group->getMangler();
+
+		/**
+		 * Get and write messages.
+		 */
+		$body = '';
+		/**
+		 * @var TMessage $message
+		 */
+		foreach ( $collection as $message ) {
+			if ( strlen( $message->translation() ) === 0 ) {
+				continue;
+			}
+
+			$key = $mangler->unmangle( $message->key() );
+			$key = $this->transformKey( self::escapeJsString( $key ) );
+
+			$translation = self::escapeJsString( $message->translation() );
+
+			$body .= "\t{$key}: \"{$translation}\",\n";
+		}
+
+		if ( strlen( $body ) === 0 ) {
+			return false;
+		}
+
+		/**
+		 * Strip last comma, re-add trailing newlines.
+		 */
+		$body = substr( $body, 0, -2 );
+		$body .= "\n";
+
+		return $header . $body . $this->footer();
+	}
+
+	/**
+	 * @param string[] $authors
+	 * @return string
+	 */
+	protected function authorsList( array $authors ) {
+		if ( $authors === [] ) {
+			return '';
+		}
+
+		$authorsList = '';
+		foreach ( $authors as $author ) {
+			$authorsList .= " *  - $author\n";
+		}
+
+		// Remove trailing newline, and return.
+		return substr( " * Translators:\n$authorsList", 0, -1 );
+	}
+
+	// See ECMA 262 section 7.8.4 for string literal format
+	private static $pairs = [
+		"\\" => "\\\\",
+		"\"" => "\\\"",
+		"'" => "\\'",
+		"\n" => "\\n",
+		"\r" => "\\r",
+
+		// To avoid closing the element or CDATA section.
+		'<' => "\\x3c",
+		'>' => "\\x3e",
+
+		// To avoid any complaints about bad entity refs.
+		'&' => "\\x26",
+
+		/*
+		 * Work around https://bugzilla.mozilla.org/show_bug.cgi?id=274152
+		 * Encode certain Unicode formatting chars so affected
+		 * versions of Gecko do not misinterpret our strings;
+		 * this is a common problem with Farsi text.
+		 */
+		"\xe2\x80\x8c" => "\\u200c", // ZERO WIDTH NON-JOINER
+		"\xe2\x80\x8d" => "\\u200d", // ZERO WIDTH JOINER
+	];
+
+	/**
+	 * @param string $string
+	 * @return string
+	 */
+	protected static function escapeJsString( $string ) {
+		return strtr( $string, self::$pairs );
+	}
+
+	/**
+	 * @param string $string
+	 * @return string
+	 */
+	protected static function unescapeJsString( $string ) {
+		return strtr( $string, array_flip( self::$pairs ) );
+	}
+}
+
+/**
+ * File format support for Shapado, which uses JavaScript based format.
+ * @ingroup FFS
+ */
+class ShapadoJsFFS extends JavaScriptFFS {
+
+	/**
+	 * @param string $key
+	 *
+	 * @return string
+	 */
+	protected function transformKey( $key ) {
+		return $key;
+	}
+
+	/**
+	 * @param string $code
+	 * @param string[] $authors
+	 * @return string
+	 */
+	protected function header( $code, array $authors ) {
+		global $wgSitename;
+
+		$name = TranslateUtils::getLanguageName( $code );
+		$native = TranslateUtils::getLanguageName( $code, $code );
+		$authorsList = $this->authorsList( $authors );
+
+		/** @cond doxygen_bug */
+		return <<<EOT
+/** Messages for $name ($native)
+ *  Exported from $wgSitename
+ *
+{$authorsList}
+ */
+
+var I18n = {
+
+EOT;
+		/** @endcond */
+	}
+
+	/**
+	 * @return string
+	 */
+	protected function footer() {
+		return "};\n\n";
+	}
+}