Make the cable feature speak English like the rest of the interface

English has been the source language of the program for a while now
(upstream: "Make English the source language ..."), the cable feature
came in with French ones: about 200 translatable strings over 30 files,
the two settings pages built from .ui files, four comments and one test
which asserted the old wording (blocking review comment by ispyisail).

The wording follows what the code base already uses where it exists:
Plant (=) and Location (+) as qetinformation.cpp names those element
information, Designation for the field the cable form calls its BMK,
Length, Sheet for folio, Automatic numbering, Cross-reference, and Right
aligned / Centred / Left aligned the way cabletextformatdialog.cpp
already spells the three alignment entries.

Two things are more than a word-for-word swap:

- xrefpropertieswidget.cpp:291 wrote the label of the master field on
  every type change with a hardcoded tr("Maitre"), so the English
  "Master" coming from the .ui was overwritten for every type, cable or
  not: a real bug next to being French. The wording now comes back from
  the .ui and only a cable renames the field to "Text:", so the two
  cannot drift apart again.

- tst_cabletypelist kept asserting that a new catalogue is *labelled*
  in French. That label line is the translated header and reads English
  now. The test still reads files with French headers on purpose:
  headerAliasMap() keeps the five old French labels as aliases next to
  the English ones, so catalogues written by earlier builds, including
  the one the reviewer reads her own types from, keep loading.

The .ts files are deliberately not regenerated here. Upstream
regenerates them on master, as it did for the language change itself,
and a translation is keyed on the source string: while the sources were
French a German user saw French in the cable dialogs, and an English
source string with no translation yet shows as it is.

Build clean, ctest 92/93, the one failure being the pre-existing
headless tst_menubarkeyboard.

sources/cable/cablepart.cpp

@@ -259,7 +259,7 @@ QFont CablePart::fontOf(const QString &key) const
 
 		//The reference to the other folios this cable runs on has a
 		//font of its own, set with the button next to its text under
-		//Querverweise -- he sets it there and not in the cable itself.
+		//Cross-references -- he sets it there and not in the cable itself.
 		//When he has left that alone, the reference follows the texts
 		//of the cable like every other line of the label does.
 	if (key == QLatin1String("xref") && m_cable && diagram() && diagram()->project())
@@ -539,7 +539,7 @@ QList<CablePart::CrossRef> CablePart::crossRefs() const
 	if (elsewhere.isEmpty()) return refs;
 
 		//The format this project asks for such a reference, chosen under
-		//Querverweise for the type "Câble": one text per folio, written
+		//Cross-references for the type "Cable": one text per folio, written
 		//out with that folio's own numbers and fields.
 	const XRefProperties xref = project->defaultXRefProperties(QStringLiteral("cable"));
 	const QString format = xref.masterLabel();
@@ -680,7 +680,7 @@ QList<CablePart::PdfRef> CablePart::pdfRefs() const
 	@brief CablePart::setUpXrefHooks
 	Keep the reference lines up to date with what the project does: a
 	folio which is added, removed or moved changes which lines there are
-	and what they say, and so does the format chosen under Querverweise.
+	and what they say, and so does the format chosen under Cross-references.
 
 	Only this line is redrawn, which is enough: the references of a
 	cable are worked out again from the cable itself every time its
@@ -1946,7 +1946,7 @@ void CablePart::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
 			diagram()->undoStack().push(new BatchCommand(
 				pending,
 				QCoreApplication::translate(
-					"BatchCommand", "Déplacer %n câble(s)",
+					"BatchCommand", "Move %n cable(s)",
 					"Un geste déplace plusieurs lignes à la fois.",
 					pending.size())));
 			pending.clear();
@@ -2231,7 +2231,7 @@ bool CablePart::rebindCore(int core, const QPointF &dropped_at,
 			//for what it did rather than for where it went.
 		const QString text = before_cores
 				? QCoreApplication::translate("ChangeCableCoresCommand",
-											  "Placer une âme de câble")
+											  "Place a cable core")
 				: QString();
 		diagram()->undoStack().push(
 			new ChangeCableCoresCommand(m_cable, before, after, text));
@@ -2276,7 +2276,7 @@ bool CablePart::takeCoreOffLine(int core)
 	diagram()->undoStack().push(new ChangeCableCoresCommand(
 		m_cable, before, after,
 		QCoreApplication::translate("ChangeCableCoresCommand",
-									"Retirer une âme de la ligne")));
+									"Remove a core from the line")));
 	return true;
 }
 
@@ -2657,13 +2657,13 @@ CablePart::ClaimAnswer CablePart::askClaim(QWidget *parent,
 {
 	QMessageBox box(QMessageBox::Question, title, question, QMessageBox::NoButton, parent);
 	QPushButton *take = box.addButton(
-		tr("Oui", "Prendre le conducteur à l'autre câble."),
+		tr("Yes", "Prendre le conducteur à l'autre câble."),
 		QMessageBox::YesRole);
 	QPushButton *leave = box.addButton(
-		tr("Non", "Laisser le conducteur à l'autre câble, on ne change rien."),
+		tr("No", "Laisser le conducteur à l'autre câble, on ne change rien."),
 		QMessageBox::NoRole);
 	QPushButton *cancel = box.addButton(
-		tr("Annuler", "Annuler le geste entier : rien n'est écrit, la ligne et ses couleurs reviennent où elles étaient."),
+		tr("Cancel", "Annuler le geste entier : rien n'est écrit, la ligne et ses couleurs reviennent où elles étaient."),
 		QMessageBox::RejectRole);
 		//The safe answer is the one under his finger, and the escape
 		//key throws the whole gesture away rather than taking a wire.
@@ -2699,9 +2699,9 @@ CablePart::ClaimAnswer CablePart::mayClaim(Conductor *conductor) const
 	const QString other_name = other ? other->designation() : QString();
 
 	const QString text = other_name.isEmpty()
-		? tr("Ce conducteur est déjà décrit par un autre câble. Voulez-vous l'attribuer au câble %1 ?",
+		? tr("This conductor is already described by another cable. Do you want to assign it to cable %1?",
 			 "Un conducteur ne peut appartenir qu'à un câble : on demande avant de le prendre à l'autre.")
-		: tr("Ce conducteur est déjà décrit par le câble %1. Voulez-vous l'attribuer au câble %2 ?",
+		: tr("This conductor is already described by cable %1. Do you want to assign it to cable %2?",
 			 "Un conducteur ne peut appartenir qu'à un câble : on demande avant de le prendre à l'autre.");
 
 	QWidget *parent = nullptr;
@@ -2710,7 +2710,7 @@ CablePart::ClaimAnswer CablePart::mayClaim(Conductor *conductor) const
 	}
 
 	return askClaim(parent,
-					tr("Conducteur déjà attribué", "Un conducteur ne peut appartenir qu'à un câble."),
+					tr("Conductor already assigned", "Un conducteur ne peut appartenir qu'à un câble."),
 					other_name.isEmpty() ? text.arg(m_cable->designation())
 										 : text.arg(other_name, m_cable->designation()));
 }
@@ -2752,19 +2752,19 @@ CablePart::ClaimAnswer CablePart::mayClaimSeveral(const QList<Conductor *> &cond
 
 	const int n = conductors.size();
 	const QString title = n <= 1
-		? tr("Conducteur déjà attribué", "Un conducteur ne peut appartenir qu'à un câble.")
-		: tr("Conducteurs déjà attribués", "Plusieurs conducteurs sont pris en une seule fois.", n);
+		? tr("Conductor already assigned", "Un conducteur ne peut appartenir qu'à un câble.")
+		: tr("Conductors already assigned", "Plusieurs conducteurs sont pris en une seule fois.", n);
 
 	const QString text = n <= 1
 		? (unnamed
-			? tr("Ce conducteur est déjà décrit par un autre câble. Voulez-vous l'attribuer au câble %1 ?",
+			? tr("This conductor is already described by another cable. Do you want to assign it to cable %1?",
 				 "Un conducteur ne peut appartenir qu'à un câble : on demande avant de le prendre à l'autre.")
-			: tr("Ce conducteur est déjà décrit par le câble %1. Voulez-vous l'attribuer au câble %2 ?",
+			: tr("This conductor is already described by cable %1. Do you want to assign it to cable %2?",
 				 "Un conducteur ne peut appartenir qu'à un câble : on demande avant de le prendre à l'autre."))
 		: (unnamed
-			? tr("%n conducteurs sont déjà décrits par d'autres câbles. Voulez-vous les attribuer au câble %1 ?",
+			? tr("%n conductors are already described by other cables. Do you want to assign them to cable %1?",
 				 "On prend plusieurs conducteurs à la fois : on demande avant de les prendre aux autres câbles.", n)
-			: tr("%n conducteurs sont déjà décrits par le câble %1. Voulez-vous les attribuer au câble %2 ?",
+			: tr("%n conductors are already described by cable %1. Do you want to assign them to cable %2?",
 				 "On prend plusieurs conducteurs à la fois : on demande avant de les prendre à l'autre câble.", n));
 
 	const QString question = unnamed