Merge upstream/master: translation wave plus generic device

Upstream moved 56 commits ahead of the last merge. Six files conflicted,
all of them files where upstream's French -> English tr() translation wave
touched lines we had also touched with the cable feature. Resolution rule
applied everywhere: take upstream's English source strings, keep our cable
additions.

Resolved:

- sources/ui/xrefpropertieswidget.ui : kept our structure (m_labels_gb
  pulled out of the display group, m_slave_row, the m_font_pb "Police..."
  button of the cable cross-reference) and mechanically applied upstream's
  20 English string replacements on top of it.

- sources/ui/xrefpropertieswidget.cpp : our version plus upstream's 7
  translated combo entries; the tr("Cable") item we add for the cable
  cross-reference type stays.

- sources/autoNum/ui/numparteditorw.cpp : upstream's English part names
  ("number format 1", "Sheet no.", "Plant", "Location", ...) for the
  number-format list, with our comment explaining why type 3 (cable) takes
  the conductor kinds of variable.

- sources/ui/configpage/configpages.cpp : upstream's English tab titles
  (Conductors / Elements / Sheets) plus our Cables tab.

- sources/ui/configpage/projectconfigpages.cpp : upstream's "Sheets" tab
  title plus our Cables tab block (single-rule SelectAutonumW(3)).

- sources/qetdiagrameditor.cpp : union of both sides - upstream's new
  "Add a generic device" action (icon, status tip, data id) and its
  English menu names ("File"/"Edit"/"Project"/"Display"), together with our
  cable action, the Numbering and Lists menus, the cable list actions and
  the CSV export in the Project menu.

Kept French: our own cable tr() source strings stay French for now. That
is the smaller change and the translation pass can follow separately.

Verified: full build 1065/1065, ctest 91/92 (only the pre-existing
headless tst_menubarkeyboard fails: no window manager, so Alt+F and F10
cannot open a menu bar), smoke start exit 124, no conflict marker left in
the tree.

sources/autoNum/ui/pastenumberingimport.cpp

@@ -81,10 +81,11 @@ void PasteNumberingImport::push(QWidget *parent,
 	}
 	const auto answer = QET::QetMessageBox::question(
 				parent,
-				tr("Numérotation absente de ce projet"),
-				tr("Les éléments collés suivent %n numérotation(s) qui n'existe(nt) pas dans ce projet : %1.\n\n"
-				   "Les importer ? Les éléments recevront alors les prochains numéros, à partir de 1. "
-				   "Sinon ils seront collés sans numérotation.", "", static_cast<int>(missing.size()))
+				tr("Numbering missing from this project"),
+				tr("The pasted elements follow %n numberings that do not exist in this project: %1.\n"
+				   "\n"
+				   "Import them? The elements will then receive the next numbers, starting from 1. Otherwise "
+				   "they will be pasted without numbering.", "", static_cast<int>(missing.size()))
 				.arg(names.join(QStringLiteral(", "))),
 				QMessageBox::Yes | QMessageBox::No,
 				QMessageBox::Yes);