Add a Copy link button to the right-click message context-menu labs feature (#8527)

* Simplify `Share` button

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

* Add proper `Copy link` button

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

* i18n

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

src/i18n/strings/en_EN.json

@@ -2921,10 +2921,10 @@
     "Forward": "Forward",
     "View source": "View source",
     "Show preview": "Show preview",
-    "Copy link": "Copy link",
     "Source URL": "Source URL",
     "Collapse reply thread": "Collapse reply thread",
     "Report": "Report",
+    "Copy link": "Copy link",
     "Forget": "Forget",
     "Mentions only": "Mentions only",
     "See room timeline (devtools)": "See room timeline (devtools)",