nusach of Modim D'Rabbanan-al sheonu/sheanachnu modim lach

The old Minhag was to say "Al She'onu Modim Loch". Generally Onu is Loshon Chazal, and Anachnu is Loshon Mikro, and in the new siddurs many times Onu was changed to Anachnu, because the printers of the new siddurs tried to change the siddur to Loshon Mikro.

Michael FRBSH