Doc: Consolidate internationalization documentation

- Combine the "Internationalization with Qt" and
  "Internationalization and Localization with Qt Quick"
  topics
- Add a "Localizing Applications" topic
- Move information from the Qt Linguist Manual developer
  section to the new topics
- Add a link to a YouTube video about localizing apps
- Use active voice and present tense

Fixes: QTBUG-71876
Change-Id: If2db1d4865e47a85e0b63adac326fc123ad65e50
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Kai Köhne <kai.koehne@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

3 files changed, 0 insertions, 36 deletions

diff --git a/doc/src/snippets/code/doc_src_i18n.cpp b/doc/src/snippets/code/doc_src_i18n.cpp
index 3452d2d75..a258d4750 100644
--- a/doc/src/snippets/code/doc_src_i18n.cpp
+++ b/doc/src/snippets/code/doc_src_i18n.cpp
@@ -70,15 +70,6 @@ void FileCopier::showProgress(int done, int total,
 //! [4]
 
 
-//! [5]
-QString s1 = "%1 of %2 files copied. Copying: %3";
-QString s2 = "Kopierer nu %3. Av totalt %2 filer er %1 kopiert.";
-
-qDebug() << s1.arg(5).arg(10).arg("somefile.txt");
-qDebug() << s2.arg(5).arg(10).arg("somefile.txt");
-//! [5]
-
-
 //! [8]
 int main(int argc, char *argv[])
 {
@@ -109,18 +100,6 @@ QString string = codec->toUnicode(encodedString);
 //! [10]
 
 
-//! [11]
-void Clock::setTime(const QTime &time)
-{
-    if (tr("AMPM") == "AMPM") {
-        // 12-hour clock
-    } else {
-        // 24-hour clock
-    }
-}
-//! [11]
-
-
 //! [12]
 void MyWidget::changeEvent(QEvent *event)
 {
diff --git a/doc/src/snippets/code/doc_src_i18n.qdoc b/doc/src/snippets/code/doc_src_i18n.qdoc
index dbfca61cf..a84076d46 100644
--- a/doc/src/snippets/code/doc_src_i18n.qdoc
+++ b/doc/src/snippets/code/doc_src_i18n.qdoc
@@ -1,12 +1,6 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
-//! [6]
-5 of 10 files copied. Copying: somefile.txt
-Kopierer nu somefile.txt. Av totalt 10 filer er 5 kopiert.
-//! [6]
-
-
 //! [7]
 HEADERS         = funnydialog.h \
                   wackywidget.h
diff --git a/doc/src/snippets/code/src_corelib_kernel_qobject.cpp b/doc/src/snippets/code/src_corelib_kernel_qobject.cpp
index bf024c93c..b4e175107 100644
--- a/doc/src/snippets/code/src_corelib_kernel_qobject.cpp
+++ b/doc/src/snippets/code/src_corelib_kernel_qobject.cpp
@@ -207,11 +207,6 @@ showMessage(tr("%n message(s) saved", "", n));
 //! [18]
 
 
-//! [19]
-n == 1 ? tr("%n message saved") : tr("%n messages saved")
-//! [19]
-
-
 //! [20]
 label->setText(tr("F\374r \310lise"));
 //! [20]
@@ -458,7 +453,3 @@ if (isSignalConnected(QMetaMethod::fromSignal(&MyObject::valueChanged))) {
 //~ magic-stuff This might mean something magic.
 QString text = MyMagicClass::tr("Sim sala bim.");
 //! [meta data]
-
-//! [explicit tr context]
-QString text = QScrollBar::tr("Page up");
-//! [explicit tr context]