[ES] Add spanish translation of Strings lesson (#1550)
[ES] Add spanish translation of Strings lesson (#1550)


doomspork/elixir_school,doomspork/elixir-school,doomspork/elixir-school,nscyclone/elixir-school,nscyclone/elixir-school,nscyclone/elixir-school,doomspork/elixir_school,doomspork/elixir-school,nscyclone/elixir-school,doomspork/elixir_school