Replace Helmholtz Login etc by Helmholtz ID

Stumbling over a complaint in outreach minutes of July:

Warum steht auf https://hifis.net/ Helmholtz Login und nicht Helmholtz ID? Dito https://hifis.net/aai/

👉 replace that on Landing page, /aai, Hamburger menu, and a quite recent blog post of april 2024.

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• Review here