Why and how the text could be Bavarian

[MHTamdgidi_(Behrooz)]

In Old Bavaria and the surrounding area, it became a kind of ritual politeness—and then, over time, a completely normal greeting. Hardly anyone thinks about its actual origin anymore.

I believe that in English there is the word “sincerely,” which also may have something to do with servants in its origin...

This is unrelated, but "I am your servant" is a very common expression used also in Persian even today.

I strongly recommend considering a cipher technique (among others) of adding/substituting a phonetic 't' (te, et, at, ta, to, ot, ...., or another consonant depending on textual or visual context), when an 'a' is surrounded, or even just preceded or proceeded by another vowel). This is just something I found implied in (my) Botrus solution possibility.

I think also focusing image labels where images are relatively identifiable can bear better fruit.

I also think that Bavarian can be a very important lead but I think it is important to consider that it could be used alongside Latin, German, or any local dialects the author (in my view Countess Margaret) could have known, but done in a way that follows the Bavarian style, perhaps. 

From my research, I have found that as a member of her dynasty, she could have spoken Tyrolean Bavarian (South Bavarian) German dialect, Italian (Venetian/Lombard dialects, since her territory included Trentino region), Ladin since it was widely spoken in her region, as well as formal courtly "Middle High German" (whatever that means, I don't know, but she used lawyers a lot for her divorce/marriage and other needs). I have even found that because of her Gorizia lineage, she could have had exposure to Slovenian. 

As I will explain later, she had every reason to make her book as difficult to decipher as possible given the circumstances in which she lived, surrounded by mortal enemies throughout her life.

I know nothing about these languages, but you and forum members who know, have a very important task ahead of you that can bear significant fruit.