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/qetdiagrameditor.cpp

@@ -751,7 +751,7 @@ void QETDiagramEditor::setUpActions()
 	connect(m_project_terminalBloc, &QAction::triggered, this, &QETDiagramEditor::generateTerminalBlock);
 
 		//Add a cable list
-	m_add_cable_list = new QAction(QET::Icons::TableOfContent, tr("Ajouter une liste de câbles"), this);
+	m_add_cable_list = new QAction(QET::Icons::TableOfContent, tr("Add a cable list"), this);
 	connect(m_add_cable_list, &QAction::triggered, this, [this]() {
 		if (this->currentDiagramView()) {
 			QetGraphicsTableFactory::createAndAddCableList(this->currentDiagramView()->diagram());
@@ -759,7 +759,7 @@ void QETDiagramEditor::setUpActions()
 	});
 
 		//Export the whole cable list to CSV, every column of the list
-	m_export_cable_list = new QAction(QET::Icons::DocumentSpreadsheet, tr("Exporter la liste des câbles au format CSV"), this);
+	m_export_cable_list = new QAction(QET::Icons::DocumentSpreadsheet, tr("Export the cable list to CSV format"), this);
 	connect(m_export_cable_list, &QAction::triggered, [this]() {
 		QETProject *project = this->currentProject();
 		if (!project) {
@@ -813,10 +813,10 @@ void QETDiagramEditor::setUpActions()
 
 	// Cable numbering: the rule the project numbers its cables with, and
 	// the numbering of every cable of that project at once
-	m_cable_numbering = new QAction(QET::Icons::AutoNum, tr("Numérotation des câbles"), this);
+	m_cable_numbering = new QAction(QET::Icons::AutoNum, tr("Cable numbering"), this);
 	m_cable_numbering->setStatusTip(
-		tr("Affiche la règle de numérotation des câbles du projet et "
-		   "renumérote ses câbles d'après elle"));
+		tr("Shows the cable numbering rule of the project and "
+		   "renumbers its cables with it"));
 	connect(m_cable_numbering, &QAction::triggered, this, &QETDiagramEditor::slot_cableNumbering);
 
 	// Reload element drawings from their current definition (bugtracker #802)
@@ -1280,7 +1280,7 @@ void QETDiagramEditor::setUpActions()
 	QAction *add_generic_device = m_add_item_actions_group.addAction(QET::Icons::GenericDevice, tr("Add a generic device…"));
 		//Not an element of the drawing but a line drawn across the
 		//conductors: what it crosses becomes the cores of a cable.
-	m_add_cable		   = m_add_item_actions_group.addAction(QET::Icons::Cable,      tr("Tracer un câble"));
+	m_add_cable		   = m_add_item_actions_group.addAction(QET::Icons::Cable,      tr("Draw a cable"));
 
 	add_text     ->setStatusTip(tr("Adds a text field to the current sheet"));
 	add_image    ->setStatusTip(tr("Add an image to the current sheet"));
@@ -1296,7 +1296,7 @@ void QETDiagramEditor::setUpActions()
 	add_fillet   ->setStatusTip(tr("Rounds the corner between two lines of the current sheet"));
 	add_terminal_strip->setStatusTip(tr("Adds a terminal plan to the current sheet"));
 	add_generic_device->setStatusTip(tr("Makes a box symbol with terminals on any side and places it on the current sheet"));
-	m_add_cable     ->setStatusTip(tr("Trace la ligne maîtresse d'un câble : chaque conducteur traversé devient une de ses âmes"));
+	m_add_cable     ->setStatusTip(tr("Draws the main line of a cable: every conductor crossed becomes one of its cores"));
 
 	add_text     ->setData(QStringLiteral("text"));
 	add_image    ->setData(QStringLiteral("image"));
@@ -1485,8 +1485,8 @@ void QETDiagramEditor::setUpMenu()
 	QMenu* menu_project	  = new QMenu(tr("&Project"), this);
 		//Numbering of everything the project numbers, kept together
 		//and sitting right behind the project it belongs to
-	QMenu* menu_numbering = new QMenu(tr("Numérotation"), this);
-	QMenu* menu_lists     = new QMenu(tr("Listes"), this);
+	QMenu* menu_numbering = new QMenu(tr("Numbering"), this);
+	QMenu* menu_lists     = new QMenu(tr("Lists"), this);
 	QMenu* menu_affichage = new QMenu(tr("Displ&ay"), this);
 	// QMenu *menu_outils    = new QMenu(tr("O&utils"), this);
 	windows_menu = new QMenu(tr("Wi&ndows"), this);
@@ -1621,7 +1621,7 @@ void QETDiagramEditor::setUpMenu()
 	menu_project -> addAction(m_export_project_db);
 #endif
 
-	// menu Numérotation
+	// menu Numbering
 		//Everything the project numbers sits here together: the
 		//terminals have come out of the project menu, the cables are
 		//the new one
@@ -2350,20 +2350,20 @@ bool QETDiagramEditor::cableNumberingGate(Diagram *diagram)
 	}
 
 	QMessageBox box(QMessageBox::Question,
-					tr("Numérotation automatique", "window title"),
-					tr("Aucune numérotation automatique des câbles n'est définie.",
+					tr("Automatic numbering", "window title"),
+					tr("No automatic cable numbering is defined.",
 					   "shown when a project has no cable numbering rule"),
 					QMessageBox::NoButton,
 					this);
 	box.setInformativeText(tr(
-		"Voulez-vous en définir une maintenant ?\n\n"
-		"Vous pourrez aussi numéroter les câbles automatiquement plus "
-		"tard : cette règle se règle à tout moment dans les propriétés "
-		"du projet, page « Numérotation auto ».",
+		"Do you want to define one now?\n\n"
+		"You can also number the cables automatically later: the rule "
+		"is set at any time in the project properties, on the "
+		"\"Auto Numbering\" page.",
 		"ask whether a cable numbering rule should be defined now"));
-	QPushButton *define_button = box.addButton(tr("Oui", "yes"), QMessageBox::YesRole);
-	QPushButton *later_button  = box.addButton(tr("Non", "no"),  QMessageBox::NoRole);
-	box.addButton(tr("Annuler", "cancel"), QMessageBox::RejectRole);
+	QPushButton *define_button = box.addButton(tr("Yes", "yes"), QMessageBox::YesRole);
+	QPushButton *later_button  = box.addButton(tr("No", "no"),  QMessageBox::NoRole);
+	box.addButton(tr("Cancel", "cancel"), QMessageBox::RejectRole);
 	box.setDefaultButton(later_button);
 	box.exec();
 
@@ -2974,7 +2974,7 @@ void QETDiagramEditor::slot_updateComplexActions()
 		//edit cable
 		else if (selected_cables)
 		{
-			m_edit_selection -> setText(tr("Éditer le câble",
+			m_edit_selection -> setText(tr("Edit the cable",
 						       "edit cable"));
 			m_edit_selection -> setIcon(QET::Icons::Cable);
 		}