feat(editor): labels for a layman, light at the start; whole sceneries fitted to the terrain model

Labels:
- every button, field, tooltip and message of the editor reread for a beginner: short nouns for the fields with the
  sentence in the tooltip, the less used options under More settings, one glossary (field of work, template, track,
  grade), sides told from directions, degrees and per mille as signs, messages built from one format string
- plural forms through STR_P; the last entry of a po file is read too, and the Polish plural rule is in the header
- lang/editor_pl.po: the code pass entries merged, 391 entries no code uses and 3 duplicates dropped
- roads: the notes and errors naming a road translated; the build options and the layout fold the texture length,
  kerb sizes, traffic share, roundabout part, height over the ground and junction speed limit under More settings, the
  lanes start folded

Grade lines fitted to the terrain model (NMT), a line or the whole scenery at once:
- fit_ground: a robust fit on nodes 5 m apart; the ground parting from the line (a bridge, a viaduct, a wall) is gone
  past rather than followed, the bends keep off the switches as far as their curves reach, a run of bends the same way
  is one point of intersection, a curve with no room is as sharp as the room lets it be
- the ends of the line and the other paths of its switches leading into lines fitted already bound the line by what
  the tracks between can climb; ends meeting in the plan, laid apart in height by hand, are joined before the run
- apply_profile: the paths are split where split_path takes the parameter (a straight was cut in the wrong place, into
  pieces of a few centimetres the game takes for zero length), no piece shorter than the margin; the paths off the
  ends of the route are brought to its height
- Bytom: 1600 lines, grade breaks at the joints 89 -> 20; Tarnowskie Gory: 848 lines, 223 -> 3; no step over 2 cm

application/editormodejoints.cpp

@@ -9,6 +9,7 @@ http://mozilla.org/MPL/2.0/.
 
 #include "stdafx.h"
 #include "application/editormode.h"
+#include "application/editormodeshared.h"
 #include "application/editoruilayer.h"
 #include "application/editorprojection.h"
 #include "editor/editorFormat.hpp"
@@ -107,9 +108,9 @@ std::string value_text(editor_mode::joint_issue const &Issue)
 	{
 	case kind::gap: return format("%.3f m", Issue.value);
 	case kind::step: return format("%.1f mm", Issue.value * 1000.0);
-	case kind::kink: return format("%.3f deg", Issue.value);
+	case kind::kink: return format("%.3f\xc2\xb0", Issue.value);
 	case kind::cant: return format("%.1f mm", Issue.value);
-	case kind::grade: return format("%.1f %%o", Issue.value);
+	case kind::grade: return format("%.1f \xe2\x80\xb0", Issue.value);
 	default: return "-";
 	}
 }
@@ -131,7 +132,7 @@ std::string name_of(TTrack const *Track)
 {
 	if (Track == nullptr)
 		return "-";
-	return Track->name().empty() ? std::string{"(noname)"} : Track->name();
+	return Track->name().empty() ? STR("(no name)") : Track->name();
 }
 
 } // namespace
@@ -387,10 +388,10 @@ void editor_mode::joints_fix(std::vector<int> const &Indices)
 void editor_mode::render_joints_body()
 {
 	auto &state{m_joints};
-	ImGui::TextDisabled("%s", STR_C("Ends of the paths which almost meet, steps, kinks,\njumps of the cant and of the grade at the joints"));
-	ImGui::RadioButton(STR_C("Around the camera"), &state.scope, 0);
-	ImGui::SameLine();
-	ImGui::RadioButton(STR_C("Whole scenery"), &state.scope, 1);
+	ImGui::PushTextWrapPos(0.0f);
+	ImGui::TextDisabled("%s", STR_C("Looks for faults at the joints of the tracks"));
+	ImGui::PopTextWrapPos();
+	segmented("jointscope", state.scope, {{0, STR_C("Around the camera")}, {1, STR_C("Whole scenery")}});
 	bool const running{state.next < state.queue.size()};
 	if (running)
 	{
@@ -400,31 +401,42 @@ void editor_mode::render_joints_body()
 		if (ImGui::SmallButton(STR_C("Cancel")))
 			state.queue.resize(state.next);
 	}
-	else if (ImGui::Button(STR_C("Check")))
+	else
 	{
-		joints_start();
+		ImGui::PushStyleColor(ImGuiCol_Button, ImGui::ColorConvertU32ToFloat4(family_colour(2, 0.55f)));
+		ImGui::PushStyleColor(ImGuiCol_ButtonHovered, ImGui::ColorConvertU32ToFloat4(family_colour(2, 0.75f)));
+		if (ImGui::Button(STR_C("Check"), ImVec2(-1.0f, std::round(ImGui::GetFrameHeight() * 1.3f))))
+			joints_start();
+		ImGui::PopStyleColor(2);
+		item_tooltip("Finds the gaps between the ends of the tracks, the steps, the kinks and the jumps of the cant and of the grade");
 	}
-	if (ImGui::TreeNode(STR_C("Limits")))
+	if (ImGui::TreeNode(STR_C("Thresholds")))
 	{
-		ImGui::PushItemWidth(100.0f);
-		if (state.scope == 0)
-			ImGui::InputDouble(STR_C("Around the camera (m)"), &state.reach, 0.0, 0.0, "%.0f");
-		ImGui::InputDouble(STR_C("Gap up to (m)"), &state.gap, 0.0, 0.0, "%.2f");
-		if (ImGui::IsItemHovered())
-			ImGui::SetTooltip("%s", STR_C("A free end closer than this to the end of another path is a gap: the trains don't go across it.\nThe simulation joins the ends no more than 2 cm apart"));
-		ImGui::InputDouble(STR_C("Step (m)"), &state.step, 0.0, 0.0, "%.3f");
-		ImGui::InputDouble(STR_C("Kink (deg)"), &state.angle, 0.0, 0.0, "%.2f");
-		ImGui::InputDouble(STR_C("Cant jump (mm)"), &state.cant, 0.0, 0.0, "%.1f");
-		ImGui::InputDouble(STR_C("Grade break (per mille)"), &state.grade, 0.0, 0.0, "%.1f");
-		ImGui::Checkbox(STR_C("Free ends too"), &state.free_ends);
-		ImGui::PopItemWidth();
+		if (begin_fields("##jointlimits", 0.55f))
+		{
+			auto const limit = [](char const *Label, char const *Id, double &Value, char const *Format) {
+				field_row(Label);
+				ImGui::InputDouble(Id, &Value, 0.0, 0.0, Format);
+			};
+			if (state.scope == 0)
+				limit("Around the camera (m)", "##jointreach", state.reach, "%.0f");
+			limit("Gap up to (m)", "##jointgap", state.gap, "%.2f");
+			if (ImGui::IsItemHovered())
+				ImGui::SetTooltip("%s", STR_C("A free end closer than this to the end of another path is a gap: the trains don't go across it.\nThe simulation joins the ends no more than 2 cm apart"));
+			limit("Step (m)", "##jointstep", state.step, "%.3f");
+			limit("Kink (deg)", "##jointkink", state.angle, "%.2f");
+			limit("Cant jump (mm)", "##jointcant", state.cant, "%.1f");
+			limit("Grade break (per mille)", "##jointgrade", state.grade, "%.1f");
+			ImGui::EndTable();
+		}
+		toggle_chips("jointflags", {{STR_C("Free ends too"), &state.free_ends}});
 		state.reach = std::clamp(state.reach, 50.0, 50000.0);
 		state.gap = std::clamp(state.gap, 0.03, 20.0);
 		state.step = std::max(0.001, state.step);
 		state.angle = std::max(0.01, state.angle);
 		state.cant = std::max(0.5, state.cant);
 		state.grade = std::max(0.5, state.grade);
-		ImGui::TextDisabled("%s", STR_C("Change the limits, then Check again"));
+		ImGui::TextDisabled("%s", STR_C("Change the thresholds, then Check again"));
 		ImGui::TreePop();
 	}
 	if (false == state.status.empty())