fix: sidebar nav text overflow for long translations

- Add text scaling for section labels (TOOLS, ADVANCED) in sidebar
- Separate explorer_section key from explorer nav label to fix ALL CAPS
- Shorten long sidebar translations: es/pt settings, pt overview, ru tools/advanced
- Fix explorer translations from ALL CAPS to proper case in all languages

src/ui/windows/send_tab.cpp

@@ -195,7 +195,7 @@ static void RenderSyncBanner(const WalletState& state) {
         ? (float)state.sync.blocks / state.sync.headers * 100.0f : 0.0f;
     char syncBuf[128];
     snprintf(syncBuf, sizeof(syncBuf),
-        "Blockchain syncing (%.1f%%)... Balances may be inaccurate.", syncPct);
+        TR("blockchain_syncing"), syncPct);
     ImGui::PushStyleColor(ImGuiCol_ChildBg, ImGui::ColorConvertU32ToFloat4(schema::UI().resolveColor(schema::UI().drawElement("tabs.send", "sync-banner-bg-color").color)));
     float syncH = std::max(schema::UI().drawElement("tabs.send", "sync-banner-min-height").size, schema::UI().drawElement("tabs.send", "sync-banner-height").size * Layout::vScale());
     ImGui::BeginChild("##SyncBanner", ImVec2(ImGui::GetContentRegionAvail().x, syncH),