Uniform NASHA product name

[fzindovh]

Issue

Product NASHA had different names depending the documentation's language

❯ grep "title: " ./pages/cloud/storage/file_storage/nas_get_started/*
./pages/cloud/storage/file_storage/nas_get_started/guide.de-de.md:title: Erste Schritte mit einem HA-NAS
./pages/cloud/storage/file_storage/nas_get_started/guide.en-asia.md:title: Getting started with a HA-NAS solution
./pages/cloud/storage/file_storage/nas_get_started/guide.en-au.md:title: Getting started with a HA-NAS solution
./pages/cloud/storage/file_storage/nas_get_started/guide.en-ca.md:title: Getting started with a HA-NAS solution
./pages/cloud/storage/file_storage/nas_get_started/guide.en-gb.md:title: Getting started with a HA-NAS solution
./pages/cloud/storage/file_storage/nas_get_started/guide.en-ie.md:title: Getting started with a HA-NAS solution
./pages/cloud/storage/file_storage/nas_get_started/guide.en-sg.md:title: Getting started with a HA-NAS solution
./pages/cloud/storage/file_storage/nas_get_started/guide.en-us.md:title: Getting started with a HA-NAS solution
./pages/cloud/storage/file_storage/nas_get_started/guide.es-es.md:title: Primeros pasos con un NAS-HA
./pages/cloud/storage/file_storage/nas_get_started/guide.es-us.md:title: Primeros pasos con un NAS-HA
./pages/cloud/storage/file_storage/nas_get_started/guide.fr-ca.md:title: Premiers pas avec un NAS-HA
./pages/cloud/storage/file_storage/nas_get_started/guide.fr-fr.md:title: Premiers pas avec un NAS-HA
./pages/cloud/storage/file_storage/nas_get_started/guide.it-it.md:title: Iniziare a utilizzare un NAS-HA
./pages/cloud/storage/file_storage/nas_get_started/guide.pl-pl.md:title: Pierwsze kroki z usługą NAS HA
./pages/cloud/storage/file_storage/nas_get_started/guide.pt-pt.md:title: Primeiros passos com um NAS-HA

Side note

• www.ovhcloud.com is impacted too.
• Mentioned in ovh/docs !3484

[fzindovh]

Some related change are in b3682f3