Add OTA build script

scripts/build-ota-translations.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+set -e
+
+DESTDIR="ota-update-$$"
+rm -rf "$DESTDIR"
+mkdir -p "$DESTDIR"
+function finish {
+    rm -rf "$DESTDIR"
+}
+trap finish EXIT
+
+# compile PO files, taking care to make them reproducible, i.e. not change if the actual
+# translations didn't change:
+for po in locales/*.po ; do
+    mo="$(basename "$po" .po).mo"
+    mogz="$mo.gz"
+    printf "%-30s" "$po"
+
+    sed -e 's/^"PO-Revision-Date: .*/"PO-Revision-Date: \\n"/g' "$po" | msgfmt -c -o "$DESTDIR/$mo" -
+    gzip --no-name -9 "$DESTDIR/$mo"
+
+    size=$(ls -ks "$DESTDIR/$mogz" | cut -d' ' -f1)
+    printf "%'3d kB  %s\n" "$size" "$(cd $DESTDIR && md5sum $mogz)"
+done
+
+# create a tarball of all updates:
+tar -C "$DESTDIR" -cf ota-update.tar .
+