change how tags are displayed in tag image

src/inc/routes/tag_image.mjs

@@ -2,7 +2,7 @@ import crypto from 'crypto';
 
 export default (router, tpl) => {
   router.get(/^\/tag_image\/(?<tag>.+)$/, async (req, res) => {
-    const tag = req.params.tag;
+    const tag = decodeURIComponent(req.params.tag);
 
     // Create a deterministic hash from the tag
     const hash = crypto.createHash('md5').update(tag).digest('hex');