Partially revert "Update some proposal languages"
Partially revert "Update some proposal languages"

keep first char in translation strings lower case

This reverts commit f2bf0e884df40a191217033f5ffb79c5781f63be.

pysv/djep,pysv/djep,EuroPython/djep,EuroPython/djep,pysv/djep,EuroPython/djep,EuroPython/djep,pysv/djep,pysv/djep