My snippet decomposes $LANG by fields. Luckily, each delimiter in $LANG syntax 
is different, so it should be fairly reliable.

added lightdm check, so this script does not mess with any other DM.

/etc/X11/Xsession.d/39-lightdm-dmrc-fix:
--------------
#!/bin/bash

# workaround for session language selection in lightdm greeter
# use .dmrc or accountsservice data (if accounts-daemon is running)

# we need this only if lightdm is being used
if pidof lightdm
then
        # if accountsservice is used, get info from there.
        if pidof accounts-daemon
        then
                LANGFILE="/var/lib/AccountsService/users/$USER"
        # if not, use .dmrc
        else
                LANGFILE="$HOME/.dmrc"
        fi

        # extract, fix and export $LANG
        TEMPLANG=$(cat "$LANGFILE" | grep ^Language= | cut -d '=' -f 2 | sed 
's/utf8/UTF8/')
        [ ! -z "$TEMPLANG" ] && export LANG=$TEMPLANG
        # convert $LANG to $LANGUAGE and export
        TEMPLANGUAGE="$(echo $LANG | cut -d '@' -f 1 | cut -d '.' -f 1):$(echo 
$LANG | cut -d '@' -f 1 | cut -d '.' -f 1 | cut -d '_' -f 1)"
        [ ! -z "$TEMPLANGUAGE" ] && export LANGUAGE=$TEMPLANGUAGE

fi
--------------


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