Add a script to fixup copyright years translations

scripts/update-year-in-po.sh

+#!/bin/sh
+set -e
+
+# prevent sed from doing stupid things in case the locale encoding doesn't
+# match the files'.  Unlikely, but doesn't hurt.
+export LANG=C
+
+year=$(grep -Po '(?<="Copyright \(c\)  2005-)20[0-9][0-9](?=\\n)' src/about.c)
+echo "new years are: $years"
+
+for f in po/*.po; do
+  echo "processing $f..."
+  sed -f /dev/stdin -i "$f" <<EOF
+/^"Copyright (c)  2005-20[0-9][0-9]\\\\n"\$/{
+  s/\\(2005-\\)20[0-9][0-9]/\\1$year/
+  n
+  :loop
+    /^msgstr/{
+      n
+      # in case the range uses something else than the ASCII dash
+      s/\\(2005.*\\)20[0-9][0-9]/\\1$year/
+      b done
+    }
+    n
+    b loop
+  :done
+}
+EOF
+done