grub, l10n: available only languages from $LOCALES in grub and installer

features.in/grub/cfg.in/86lang.cfg

 submenu $"Change language (press F2)" --hotkey 'f2' --id 'lang' {
 	insmod regexp
-	for langstr in "ru_RU=Russian" "en_US=English" "pt_BR=Portuguese" "uk_UA=Ukrainian"; do
+	for langstr in \
+		"ru_RU=Russian" \
+		"en_US=English" \
+		"pt_BR=Portuguese" \
+		"uk_UA=Ukrainian" \
+		; do
 		regexp -s 2:langname -s 1:langcode '(.*)=(.*)' "$langstr"
+		for locale in @LOCALES@; do
+			if [ "$locale" != "$langcode" ]; then continue; fi
 			menuentry "${langname}" "$langcode" {
 				lang="$2"
 				export lang
 				configfile ${prefix}/grub.cfg
 			}
 		done
+	done
 	menuentry $"Return to the Main menu" {
 		configfile ${prefix}/grub.cfg
 	}

features.in/grub/generate.mk

@@ -25,7 +25,7 @@ ifneq (,$(GRUB_UI))
 GRUB_CFG := $(GRUB_CFG) gfxterm
 endif
 
-ifneq (,$(LOCALE))
+ifneq (,$(LOCALES))
 GRUB_CFG := $(GRUB_CFG) lang
 endif
 
@@ -103,6 +103,9 @@ bootargs: clean
 		sed -i "s, lang=.lang,,g" $(DSTCFGS); \
 	fi; \
 	sed -i "/lang=@LOCALE@/d" $(DSTCFGS)
+	@if [ -n "$(LOCALES)" ]; then \
+		sed -i "s,@LOCALES@,$(LOCALES),g" $(DSTCFGS); \
+	fi
 	@GRUBTHEME=$(GRUBTHEME); \
 	[ -n "$$GRUBTHEME" ] || GRUBTHEME=$$(cut -d "-" -f2 <<< $(BRANDING)); \
 	sed -i "s,@grubtheme@,$$GRUBTHEME,g" $(DSTCFGS)

features.in/l10n/install2/image-scripts.d/50-l10n-sysconfig

+#!/bin/bash
+
+langlist="/etc/alterator/sysconfig/lang/langlist.all"
+langlist_temp="$langlist".temp
+locales="$GLOBAL_LOCALES"
+
+[ -f "$langlist" ] || exit 0
+[ -n "$locales" ] || exit 0
+
+rm -f "$langlist_temp"
+
+for lang in $locales; do
+	grep -q "$lang" "$langlist" && grep "$lang" "$langlist" >> "$langlist_temp"
+done
+
+mv "$langlist_temp" "$langlist"

features.in/l10n/rootfs/image-scripts.d/50-l10n-sysconfig

+#!/bin/bash
+
+langlist="/etc/alterator/sysconfig/lang/langlist.all"
+langlist_temp="$langlist".temp
+locales="$GLOBAL_LOCALES"
+
+[ -f "$langlist" ] || exit 0
+[ -n "$locales" ] || exit 0
+
+rm -f "$langlist_temp"
+
+for lang in $locales; do
+	grep -q "$lang" "$langlist" && grep "$lang" "$langlist" >> "$langlist_temp"
+done
+
+mv "$langlist_temp" "$langlist"