[PROBLEM] iPad Mini 1 - no access to MOODE GUI

[Miss Sissy Princess]

My conclusion: I do not believe there is a mistake on the configuration of my RPi as it is basically working, I fear that the iPad Mini 1 is so old that it can not display the GUI correctly.

I tend to think that you are correct.  While it was good debugging to try several browsers, they all rely on the underlying Safari rendering engine, so I'm not surprised that the results were the same.

I wonder if this is related to what you've seen:  

http://moodeaudio.org/forum/showthread.php?tid=1640