Change bash scripts to be POSIX-compatible

some Unix-like operating systems, namely Alpine, don't come with bash
preinstalled.
scripts in the lib-src/ directory were left untouched.

Signed-off-by: Sol Fisher Romanoff <sol@solfisher.com>

locale/no_id.sh

@@ -1,3 +1,5 @@
+#!/bin/sh
+
 for i in *.po; do
     sed -i '/^Project/d' $i
-done
+done