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/pages/settings_page.cpp

@@ -1675,7 +1675,7 @@ void RenderSettingsPage(App* app) {
     // EXPLORER & OPTIONS — full-width card
     // ====================================================================
     {
-        Type().textColored(TypeStyle::Overline, OnSurfaceMedium(), TR("explorer"));
+        Type().textColored(TypeStyle::Overline, OnSurfaceMedium(), TR("explorer_section"));
         ImGui::Dummy(ImVec2(0, Layout::spacingXs()));
 
         ImVec2 cardMin = ImGui::GetCursorScreenPos();

src/ui/sidebar.h

@@ -557,15 +557,21 @@ inline bool RenderSidebar(NavPage& current, float sidebarWidth, float contentHei
     if (showLabels) {
         ImFont* olFont = Type().overline();
         float olFontSz = ScaledFontSize(olFont);
+        float maxSectionW = panelRight - wp.x - sbSectionLabelPadLeft;
         int si = 0;
         for (int i = 0; i < (int)NavPage::Count_; ++i) {
             if (kNavItems[i].section_label && si < nSectionLabels) {
                 float ly = panelTopY + sectionLabelY[si++];
+                const char* sLabel = NavSectionLabel(kNavItems[i]);
+                float drawFsz = olFontSz;
+                ImVec2 sLabelSz = olFont->CalcTextSizeA(drawFsz, 1000.0f, 0.0f, sLabel);
+                if (sLabelSz.x > maxSectionW && maxSectionW > 0)
+                    drawFsz *= maxSectionW / sLabelSz.x;
                 ImVec4 olCol = ImGui::ColorConvertU32ToFloat4(OnSurfaceMedium());
                 olCol.w *= expandFrac;
-                dl->AddText(olFont, olFontSz,
+                dl->AddText(olFont, drawFsz,
                     ImVec2(wp.x + sbSectionLabelPadLeft, ly),
-                    ImGui::ColorConvertFloat4ToU32(olCol), NavSectionLabel(kNavItems[i]));
+                    ImGui::ColorConvertFloat4ToU32(olCol), sLabel);
             }
         }
     } else {

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),