Do not bundle translations with a binary,
package them to system dir and use %lang tagging in package.

some paths debug:
  qWarning() << "language: " << language;
  qWarning() << "qtpath: " << QLibraryInfo::location(QLibraryInfo::TranslationsPath);
  qWarning() << "apppath: " << a.applicationDirPath();
  qWarning() << "curdir: " << QDir::currentPath();

TODO: add install target
TODO: make it configurable via cmake params.

Author: Elan Ruusamäe <glen@pld-linux.org>

--- clementine-1.3.1/src/main.cpp.orig	2016-04-19 17:43:09.000000000 +0200
+++ clementine-1.3.1/src/main.cpp	2022-07-09 07:56:27.319171455 +0200
@@ -396,7 +396,6 @@ int main(int argc, char* argv[]) {
 
   // Resources
   Q_INIT_RESOURCE(data);
-  Q_INIT_RESOURCE(translations);
 
   // Add root CA cert for SoundCloud, whose certificate is missing on OS X.
   QSslSocket::addDefaultCaCertificates(
@@ -417,10 +416,15 @@ int main(int argc, char* argv[]) {
                                : override_language;
 
   // Translations
-  LoadTranslation("qt", QLibraryInfo::location(QLibraryInfo::TranslationsPath),
-                  language);
+  // Qt: system path
+  LoadTranslation("qt", QLibraryInfo::location(QLibraryInfo::TranslationsPath), language);
+  // Clementine: system path
+  LoadTranslation("clementine", QLibraryInfo::location(QLibraryInfo::TranslationsPath), language);
+  // Clementine: QRC
   LoadTranslation("clementine", ":/translations", language);
+  // Clementine: application path
   LoadTranslation("clementine", a.applicationDirPath(), language);
+  // Clementine: current dir
   LoadTranslation("clementine", QDir::currentPath(), language);
 
 #ifdef Q_OS_WIN32
--- clementine-1.3.1/src/ui/behavioursettingspage.cpp.orig	2015-12-15 13:13:23.000000000 +0100
+++ clementine-1.3.1/src/ui/behavioursettingspage.cpp	2022-07-09 07:58:06.261968769 +0200
@@ -23,6 +23,7 @@
 #include "playlist/playlisttabbar.h"
 
 #include <QDir>
+#include <QLibraryInfo>
 
 namespace {
 bool LocaleAwareCompare(const QString& a, const QString& b) {
@@ -59,16 +60,15 @@ BehaviourSettingsPage::BehaviourSettings
   ui_->menu_previousmode->setItemData(0, Player::PreviousBehaviour_DontRestart);
   ui_->menu_previousmode->setItemData(1, Player::PreviousBehaviour_Restart);
 
-  // Populate the language combo box.  We do this by looking at all the
-  // compiled in translations.
-  QDir dir(":/translations/");
-  QStringList codes(dir.entryList(QStringList() << "*.qm"));
-  QRegExp lang_re("^clementine_(.*).qm$");
-  for (const QString& filename : codes) {
-    // The regex captures the "ru" from "clementine_ru.qm"
-    if (!lang_re.exactMatch(filename)) continue;
+  // Populate the language combo box
+  // We do this by looking at all the compiled in translations.
+  QDir localeDir(QLibraryInfo::location(QLibraryInfo::TranslationsPath));
+  QStringList dirList = localeDir.entryList(QDir::Dirs | QDir::NoDotAndDotDot, QDir::Name);
+  foreach (const QString& code, dirList) {
+    if (!QFile::exists(QLibraryInfo::location(QLibraryInfo::TranslationsPath) + "/" + code + "/LC_MESSAGES/clementine.qm")) {
+       continue;
+    }
 
-    QString code = lang_re.cap(1);
     QString lookup_code = QString(code)
                               .replace("@latin", "_Latn")
                               .replace("_CN", "_Hans_CN")
--- clementine-0.5.3/cmake/Translations.cmake	2010-10-18 23:59:53.487509786 +0300
+++ clementine-0.5.3/cmake/Translations.cmake	2010-10-19 01:42:52.112825900 +0300
@@ -65,10 +65,22 @@
 
-  # Generate a qrc file for the translations
-  set(_qrc ${CMAKE_CURRENT_BINARY_DIR}/${ADD_PO_DIRECTORY}/translations.qrc)
-  file(WRITE ${_qrc} "<RCC><qresource prefix=\"/${ADD_PO_DIRECTORY}\">")
-  foreach(_lang ${ADD_PO_LANGUAGES})
-    file(APPEND ${_qrc} "<file>${po_prefix}${_lang}.qm</file>")
-  endforeach(_lang)
-  file(APPEND ${_qrc} "</qresource></RCC>")
-  qt4_add_resources(${outfiles} ${_qrc})
+  # install .qm
+  set(_potBasename "clementine")
+  foreach (_lang ${ADD_PO_LANGUAGES})
+    set(_qm_filename "clementine_${_lang}.qm")
+    set(_qm_filepath "${CMAKE_CURRENT_BINARY_DIR}/${ADD_PO_DIRECTORY}/${_qm_filename}")
+
+    install(FILES ${_qm_filepath} DESTINATION share/locale/${_lang}/LC_MESSAGES RENAME ${_potBasename}.qm)
+    set(_gmoFiles ${_gmoFiles} ${_gmoFile})
+  endforeach (_lang)
+
+  add_custom_target(translations ALL DEPENDS ${_gmoFiles})
+
+#  # Generate a qrc file for the translations
+#  set(_qrc ${CMAKE_CURRENT_BINARY_DIR}/${ADD_PO_DIRECTORY}/translations.qrc)
+#  file(WRITE ${_qrc} "<RCC><qresource prefix=\"/${ADD_PO_DIRECTORY}\">")
+#  foreach(_lang ${ADD_PO_LANGUAGES})
+#    file(APPEND ${_qrc} "<file>${po_prefix}${_lang}.qm</file>")
+#  endforeach(_lang)
+#  file(APPEND ${_qrc} "</qresource></RCC>")
+#  qt4_add_resources(${outfiles} ${_qrc})
 endmacro(add_po)
--- clementine-1.1.1/tests/resources_env.h~	2013-09-08 01:29:59.000000000 +0300
+++ clementine-1.1.1/tests/resources_env.h	2013-09-08 01:30:00.886424405 +0300
@@ -26,7 +26,7 @@
 public:
   void SetUp() {
     Q_INIT_RESOURCE(data);
-    Q_INIT_RESOURCE(translations);
+//    Q_INIT_RESOURCE(translations);
     Q_INIT_RESOURCE(testdata);
   }
 };
--- clementine-1.1.1/tests/translations_test.cpp~	2013-09-08 01:34:17.000000000 +0300
+++ clementine-1.1.1/tests/translations_test.cpp	2013-09-08 01:34:21.084475375 +0300
@@ -23,14 +23,14 @@
 #include "test_utils.h"
 
 TEST(Translations, Basic) {
-  ASSERT_TRUE(QFile::exists(":/translations"));
-  ASSERT_TRUE(QFile::exists(":/translations/clementine_es.qm"));
+//  ASSERT_TRUE(QFile::exists(":/translations"));
+//  ASSERT_TRUE(QFile::exists(":/translations/clementine_es.qm"));
 
   PoTranslator t;
   t.load("clementine_es.qm", ":/translations");
 
-  EXPECT_EQ(QString::fromUtf8("Colección"),
-            t.translate("MainWindow", "Library"));
-  EXPECT_EQ(QString::fromUtf8("Colección"),
-            t.translate("", "Library"));
+//  EXPECT_EQ(QString::fromUtf8("Colección"),
+//            t.translate("MainWindow", "Library"));
+//  EXPECT_EQ(QString::fromUtf8("Colección"),
+//            t.translate("", "Library"));
 }