Allow highlighting tsx files

Change-Id: I9a4361933a72dd38409ba43f11221fa6c7e1f997

web/element/language.ts

diff --git a/web/element/language.ts b/web/element/language.ts
index d26b034..ce52f63 100644
--- a/web/element/language.ts
+++ b/web/element/language.ts
@@ -345,6 +345,8 @@
       return StreamLanguage.define(toml);
     case 'application/typescript':
       return javascript({typescript: true});
+    case 'text/tsx':
+      return javascript({jsx: true, typescript: true});
     case 'text/x-ttcn':
       return StreamLanguage.define(ttcn);
     case 'text/turtle':