gdm3 has a terribe bug: does not show russian languaje if are
secondary or as alternative

i installed debian 8 from scrach in spanish and then adde russian
languaje locale as second optionaly..

the iso used was DVD flavor with GDM3 as display manager..
NOTE: all the es_XX, ru_XX and en_XX locales where are generated
correctly i mans ALL including ucranian russian UTF8 and non UTF8
locales

then the screen of the GDM3 are showed, only englich and spanish are
availables..

restarted and again try to login and only spanish and russian are availables..

install the lightdm (due now debians only offerts NOTHING display
managers such GMD3 and LIGHTY)

then now russian are available in languaje choices only if lightdm are
set as default

but are not saved for specific users as defaul languje, so all users
if choose another languaje optionally to use, does not saved as user
default.. like DEbian squeeze does perfectly and debian lenny!