I assume you also have a K810, and that your firmware is R8BF003, or? If your only prerequisite is that your phone should have english language you can use the FS and custpack below (contains english language).

These should be good for you;
Main: K810_R8BF003_MAIN_GENERIC_SM_RED53
FS: K810_R8BF003_FS_TELEF_GEN_RED53
Cust. pack: HB1-06_Gen_CDA102568_11_R8A_GENERIC_EUROPE_2

you'll find these in the download section.