i18n: find the strings the audit could not see, and the apps it never checked

pisti87 reported a long list of text that stays English whatever the language,
and said the strings were in his language file and still did not appear (#257).
Both halves are true, and the reason is the audit.

The extractor only ever recognised TR("literal"). Three very common shapes were
therefore invisible:

  mk_row_btn("Reload tiles in view", cb)      // helper TR()s its parameter
  for (auto& r : rows) TR(r.label)            // literal lives in a local table
  TR(contactsSortOptName(m))                  // helper returns one of several

All three translate correctly at runtime, so the source looks properly wrapped.
But the literal at the call site was never emitted as a key, so it never entered
a .lang file, so no translator could ever supply it -- and adding it by hand
did nothing, because the audit's key list is what the files are checked against.
That is 51 strings across the map options sheet, the sort sheets, the contacts
filters and the home launcher.

The audit now understands all three, plus tr("...") in the Lua apps, and the
newly visible keys are in all thirteen files as placeholders so translators can
see them. 1017 keys, up from 966.

Four strings were genuinely raw and are now wrapped: the reader's idle status,
the Discover empty feed, the crash-report export button and Paste (move/copy).

Lua apps had no way to translate anything at all, so every built-in was hard
English regardless of the device language. wada.sys.tr() gives them the same
table the interface uses; airtime 1.4 is the first to use it, with the
`sys.tr or identity` fallback so it still runs on older firmware.

Two more instances of the drift this issue is really about:

  - gen-lua-builtin.py read out/firmware/apps/, which nothing writes -- the
    deploy rsyncs deploy/apps/ straight to the VPS. So the mirror was stale and
    the two apps added in beta_68 were never baked in: boards that cannot reach
    the Store shipped without them. It reads the canonical directory now, and
    regenerates from the same pre-build hook as the language table.
  - Baking a row whose translation equals its key does nothing, since TR()
    returns the key on a miss. Skipping them takes the header from 1.11 MB to
    939 KB and gives the V4 back 16 KB of flash, which matters at 89%.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/ui-touch/UITask.cpp

@@ -20662,7 +20662,7 @@ static void fmOpenActions(const char* name, bool isdir) {
 #endif
   }
   if (s_fm_clip.active) {
-    fmActionBtn(card, s_fm_clip.is_cut ? "Paste (move)" : "Paste (copy)", fmActPasteCb, 0x2D4A2D);
+    fmActionBtn(card, s_fm_clip.is_cut ? TR("Paste (move)") : TR("Paste (copy)"), fmActPasteCb, 0x2D4A2D);
   }
 }
 
@@ -22414,7 +22414,8 @@ static void openReaderPage() {
   lv_obj_set_pos(s_reader_status, 6, top + 44);
   lv_obj_set_style_text_font(s_reader_status, &g_font_12, LV_PART_MAIN);
   lv_obj_set_style_text_color(s_reader_status, lv_color_hex(COLOR_SUB), LV_PART_MAIN);
-  lv_label_set_text(s_reader_status, s_reader_msg[0] ? s_reader_msg : "On-device text browser \xc2\xb7 no proxy, no tracking");
+  lv_label_set_text(s_reader_status, s_reader_msg[0] ? s_reader_msg
+                                                    : TR("On-device text browser \xc2\xb7 no proxy, no tracking"));
   // (Collapsed state shows the URL in the status-bar title zone — see readerSetAddrExpanded.)
   // --- Body: a vertical scroll container we fill with paragraph + link labels ---
   s_reader_scroll = lv_obj_create(s_reader_root);
@@ -22675,7 +22676,7 @@ static void discoverBuildFeed() {
       (unsigned)discTypeColor(h.node_type), disp_esc, discTypeShort(h.node_type),
       (int)h.our_rssi, (double)h.our_snr_q4 / 4.0, direct, dist_seg, ago);
   }
-  if (q == 0) snprintf(buf, sizeof buf, "#7A7F87 Scanning\xE2\x80\xA6 nothing has answered yet#");
+  if (q == 0) snprintf(buf, sizeof buf, TR("#7A7F87 Scanning\xE2\x80\xA6 nothing has answered yet#"));
   else if (buf[q - 1] == '\n') buf[q - 1] = '\0';
   lv_label_set_text(s_discover_feed, buf);
   if (s_discover_status)
@@ -31574,8 +31575,8 @@ static void settingsCatBuild(int cat) {
         lv_obj_set_style_bg_color(crash_btn, lv_color_hex(0x8A3B2E), LV_PART_MAIN);  // warning red-brown
         lv_obj_add_event_cb(crash_btn, crashDumpExportCb, LV_EVENT_CLICKED, nullptr);
         lv_obj_t* cbl = lv_label_create(crash_btn);
-        char ct[56];
-        snprintf(ct, sizeof ct, LV_SYMBOL_WARNING "  Export crash report (%uK)",
+        char ct[96];   // room for a translated label
+        snprintf(ct, sizeof ct, TR(LV_SYMBOL_WARNING "  Export crash report (%uK)"),
                  (unsigned)(s_crash_dump_size / 1024));
         lv_label_set_text(cbl, ct);
         lv_obj_set_style_text_font(cbl, &g_font_14, LV_PART_MAIN);