Fix for missing sound files in german sound language package

There are some sound files missing in the German sound language package, which can cause the voicemail box to crash.
These are variations of ‘EINS’ (1):
1F (‘EINE’)
1N (‘EIN’)

These are currently missing from the voice package. This causes the voicemail box to abort if 1 message is present after ‘Du hast…’ / ‘You have…’.
Reference the following posts:
https://community.freepbx.org/t/voicemail-issue-with-german-language/66636
https://community.freepbx.org/t/voicemail-crashing-file-digits-1f-does-not-exist-in-any-format/62169
https://community.freepbx.org/t/voicemail-hangs-up/68871

I organized the missing files from another source [asterisksounds.org] and integrated them accordingly.
They sound a bit different than the original files [Zapp Media Berlin] but are at least grammatically correct and there is no dropout.

I have attached the corresponding files and instructions for the integration here.