Fix 9 messages always shown in French; add missing English

Nine messages were never passed through tr(), so every user saw them in
French: the undo entries for grouping and ungrouping terminals, for
editing an arc (3), an ellipse, a rectangle and a PLC table in the
element editor, and the error box when integrating a title block
template fails. They are now wrapped, text unchanged.

qet_en.ts also lacked English for 63 messages added since the last
translations update (Customize dialog, mouse gestures, toolbar contents,
mirror, element scale, paste element information, paper format).
update_translations was run on qet_en.ts with lupdate's guessing
heuristics off, then the 72 new entries were translated. Most of the
diff is lupdate refreshing line numbers.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

sources/editor/ui/ellipseeditor.cpp

@@ -149,7 +149,7 @@ void EllipseEditor::updateRect()
 		if (rect != part->property("rect"))
 		{
 			auto undo= new QPropertyUndoCommand(ellipse, "rect", ellipse->property("rect"), rect);
-			undo->setText("Modifier une ellipse");
+			undo->setText(tr("Modifier une ellipse"));
 			undo->enableAnimation();
 			elementScene()->undoStack().push(undo);
 		}