[i18n] horde-imp greek translation

[Σπανουδάκης Μανώλης]

I've a new horde (3.3.8) installation with IMP version H3 (4.3.7) on a Solaris 10 server.
I'm trying to make work the greek translation, but with no success.
I follow the Translations don't work documentation.

Step 3 (Get a string to translate) is not working.
Step 4 (Does the local Horde file work?) is partial working:
  a.. Assuming that you have put the translated Horde file in...
  I GET:
  Message (NOT OK)
  b.. Create a file in the horde directory, langtest.php:
  I GET:
  Memory exhausted (NOT OK)
  Μήνυμα (OK)
  Μήνυμα (OK)
Could you please help?