[Koha] sorting issues in Armenian catalogue

[Haik Zargaryan]

Dear List,

We are using koha 3.14.  Our catalog mainly consists of Armenian language records.  When I search in the Armenian language records using a keyword and then sort the records in Title A-Z order, the search results are not sorted alphabetically.  I have found discussion on this issue and after going through it my understanding is that additional sorting rules can be defined in the file sort-string-utf.chr located in the /etc/koha/zebradb/lang_defs/en directory.  Anyway, when I am adding the Armenian Unicode letters (marked in red and bold) to introduce correct sorting order:
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lowercase {0-9}{a-y}üzæäøöåաբգդեզէըթժիլխծկհձղճմյնշոչպջռսվտրցուփքևօֆ

uppercase {0-9}{A-Y}ÜZÆÄØÖÅԱԲԳԴԵԶԷԸԹԺԻԼԽԾԿՀՁՂՃՄՅՆՇՈՉՊՋՌՍՎՏՐՑՈՒՓՔԵՎՕՖ
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the letters are not saved properly in the file, which is in ANSI encoding.  


Please advise me what should I do on the matters below.  
- In what encoding the Armenian letters or the sort-string-utf.chr file should be?
- Am I adding the letters in the correct file and in the correct place, or should I create a new directory/file for the Armenian language?
- Should the Zebra be re-indexed to implement the changes?
 
Regards,
Haik.