wayland: lang keys for the staged portal failures

Five keys, appended to `template.rs` and to every `src/lang/*.rs`. `it.rs` gets
empty values, as AGENTS.md requires -- it is maintained by hand by its
translator. No `en.rs` entries: each key is already its own English display
text, which is also what an older peer falls back to.

Two carry a `{}`: the portal's response code, and the name of the GStreamer
element that could not be created. `lang.rs`'s `extract_placeholder` resolves a
key by replacing the first `{...}` with `{}`, which is why the server sends the
value still inside the braces and why the scrap side strips braces out of any
detail before it gets there.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EZ49AbZJYfm8NTp5yDPMab

src/lang/sk.rs

@@ -770,5 +770,10 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("port-forward-mux-tip", "Vedie všetky pripojenia jedného presmerovania portov cez jediné pripojenie k druhej strane namiesto opakovaného pripájania a prihlasovania pre každé z nich."),
         ("Enable WebRTC P2P connection", "Povoliť pripojenie WebRTC P2P"),
         ("Enable TCP hole punching", "Povoliť TCP hole punching"),
+        ("The screen sharing request was declined on the remote device", "Žiadosť o zdieľanie obrazovky bola na vzdialenom zariadení odmietnutá"),
+        ("No one responded to the screen sharing request on the remote device", "Na žiadosť o zdieľanie obrazovky na vzdialenom zariadení nikto neodpovedal"),
+        ("The XDG Desktop Portal ended the screen sharing request ({})", "XDG Desktop Portal ukončil žiadosť o zdieľanie obrazovky ({})"),
+        ("The XDG Desktop Portal returned no screen to capture, the PipeWire library may be too old", "XDG Desktop Portal nevrátil žiadnu obrazovku na zachytenie, knižnica PipeWire môže byť príliš stará"),
+        ("A GStreamer plugin needed for screen capture is missing ({})", "Chýba zásuvný modul GStreamer potrebný na zachytenie obrazovky ({})"),
     ].iter().cloned().collect();
 }