build: automatically determine macOS translations

Rather than using OSX_QT_TRANSLATIONS which must be manually updated,
and we forget to update anyway, i.e: #19059, automatically find and copy
available translations from the translations directory.

Makefile.am

@@ -41,7 +41,6 @@ OSX_DEPLOY_SCRIPT=$(top_srcdir)/contrib/macdeploy/macdeployqtplus
 OSX_FANCY_PLIST=$(top_srcdir)/contrib/macdeploy/fancy.plist
 OSX_INSTALLER_ICONS=$(top_srcdir)/src/qt/res/icons/bitcoin.icns
 OSX_PLIST=$(top_builddir)/share/qt/Info.plist #not installed
-OSX_QT_TRANSLATIONS = ar,bg,ca,cs,da,de,es,fa,fi,fr,gd,gl,he,hu,it,ja,ko,lt,lv,pl,pt,ru,sk,sl,sv,uk,zh_CN,zh_TW
 
 DIST_CONTRIB = \
 	       $(top_srcdir)/contrib/linearize/linearize-data.py \
@@ -117,7 +116,7 @@ osx_volname:
 
 if BUILD_DARWIN
 $(OSX_DMG): $(OSX_APP_BUILT) $(OSX_PACKAGING) $(OSX_BACKGROUND_IMAGE)
-	$(PYTHON) $(OSX_DEPLOY_SCRIPT) $(OSX_APP) -add-qt-tr $(OSX_QT_TRANSLATIONS) -translations-dir=$(QT_TRANSLATION_DIR) -dmg -fancy $(OSX_FANCY_PLIST) -verbose 2 -volname $(OSX_VOLNAME)
+	$(PYTHON) $(OSX_DEPLOY_SCRIPT) $(OSX_APP) -translations-dir=$(QT_TRANSLATION_DIR) -dmg -fancy $(OSX_FANCY_PLIST) -verbose 2 -volname $(OSX_VOLNAME)
 
 $(OSX_BACKGROUND_IMAGE).png: contrib/macdeploy/$(OSX_BACKGROUND_SVG)
 	sed 's/PACKAGE_NAME/$(PACKAGE_NAME)/' < "$<" | $(RSVG_CONVERT) -f png -d 36 -p 36 -o $@
@@ -151,7 +150,7 @@ $(APP_DIST_DIR)/.DS_Store: $(OSX_DSSTORE_GEN)
 	$(PYTHON) $< "$@" "$(OSX_VOLNAME)"
 
 $(APP_DIST_DIR)/$(OSX_APP)/Contents/MacOS/Bitcoin-Qt: $(OSX_APP_BUILT) $(OSX_PACKAGING)
-	INSTALLNAMETOOL=$(INSTALLNAMETOOL)  OTOOL=$(OTOOL) STRIP=$(STRIP) $(PYTHON) $(OSX_DEPLOY_SCRIPT) $(OSX_APP) -translations-dir=$(QT_TRANSLATION_DIR) -add-qt-tr $(OSX_QT_TRANSLATIONS) -verbose 2
+	INSTALLNAMETOOL=$(INSTALLNAMETOOL)  OTOOL=$(OTOOL) STRIP=$(STRIP) $(PYTHON) $(OSX_DEPLOY_SCRIPT) $(OSX_APP) -translations-dir=$(QT_TRANSLATION_DIR) -verbose 2
 
 deploydir: $(APP_DIST_EXTRAS)
 endif