build: rework i18n-sync.sh to support new structure

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

build/i18n-sync.sh

@@ -1,25 +1,18 @@
 #!/bin/sh
 
-for m in */*/Makefile; do
-	if grep -qE '^PO *=' $m; then
-		p="${m%/Makefile}"
-		t="$(sed -ne 's/^PO *= *//p' $m)"
+[ -d ./build ] || {
+	echo "Execute as ./build/i18n-sync.sh" >&2
+	exit 1
+}
 
-		case "$t" in
-			*\ *)
-				echo "WARNING: Cannot handle $p" >&2
-				continue
-			;;
-			*base*)
-				continue
-			;;
-		esac
+./build/mkbasepot.sh
 
-		if [ -f "po/templates/$t.pot" ]; then
-			./build/i18n-scan.pl "$p" > "po/templates/$t.pot"
-		fi
-	fi
-done
+find . -name '*.pot' -and -not -name base.pot -and -not -name rrdtool.pot | \
+	while read path; do
+		dir="${path%/po/templates/*}"
+		echo -n "Updating ${path#./} ... "
+		./build/i18n-scan.pl "$dir" > "$path"
+		echo "done"
+	done
 
-./build/mkbasepot.sh
-./build/i18n-update.pl po
+./build/i18n-update.pl