Update the Mongolian translation of the Handbook.
MFen:
1.28 -> 1.20 mn_MN.UTF-8/books/handbook/audit/chapter.sgml
1.275 -> 1.277 mn_MN.UTF-8/books/handbook/disks/chapter.sgml
1.30 -> 1.32 mn_MN.UTF-8/books/handbook/geom/chapter.sgml
1.380 -> 1.381 mn_MN.UTF-8/books/handbook/install/chapter.sgml
Submitted by: Ganbold Tsagaankhuu, ganbold at micom.mng.net