Modify the Dictionary meta data

[yaodis]

hello everyone
i want to use using more than one dictionary at the same time, that is meaning like this

If you select a word with the cursor in your kindle- the translation pops up. Then if you press enter you get to the dictionary. And now if I select a word within my dictionary- the definition from another dictionary pops up.

and stehk's tutorial really works. But there still something I am confused and want to konw
because besides stehk's post I also read some other people's post

From https://wiki.mobileread.com/wiki/MOBI I noticed in that in the MOBI header, at offsets 96 and 100 are the input and output languages for dictionaries.

It seems that Mobi2Mobi is reporting the language locale field at offset 92 and ignores the two next fields.

I then used a Hex editor to patch these fields in my spanish dictionary to 1034 1034 and in my german dictionary to 1031 1031 (replicating the language locale field indicated by Mobi2Mobi from offset 92).

so I was wondering
1.which meta data the mobiPatch modified
2.which meta data the mobi2mobi modified
3.how many meta data inferred to language totally have

and last
i also want to modify the meta using hex edit like this, but I didn't see the similar result, and they don't match https://wiki.mobileread.com/wiki/MOBI#MOBI_Header have said.