Tidy up error messages for application properties
Tidy up error messages for application properties

pedrosnk/elixir,joshprice/elixir,gfvcastro/elixir,kelvinst/elixir,ggcampinho/elixir,gfvcastro/elixir,kimshrier/elixir,lexmag/elixir,lexmag/elixir,beedub/elixir,ggcampinho/elixir,elixir-lang/elixir,pedrosnk/elixir,kelvinst/elixir,antipax/elixir,beedub/elixir,kimshrier/elixir,antipax/elixir,michalmuskala/elixir