[PT] added portuguese translation to mix-tasks section (#725)
[PT] added portuguese translation to mix-tasks section (#725)

* [PT] added portuguese translation to mix-tasks section

Signed-off-by: capaci <1a39a6ab483fa561ab117b33a12c11ae6b953387@gmail.com>

* [pt] fix the translation of some sections

Signed-off-by: capaci <1a39a6ab483fa561ab117b33a12c11ae6b953387@gmail.com>

* fix mix-tasks.md portuguese translation

Signed-off-by: capaci <1a39a6ab483fa561ab117b33a12c11ae6b953387@gmail.com>

* [PT] some fix in portuguese translation of mix-tasks.md

doomspork/elixir-school,yuriibodarev/elixir-school,ElixirVietnam/elixir-school,doomspork/elixir-school,huydx/elixir-school,doomspork/elixir_school,erickgnavar/elixir-school,psantos10/elixir-school,nscyclone/elixir-school,huydx/elixir-school,psantos10/elixir-school,erickgnavar/elixir-school,yuriibodarev/elixir-school,erickgnavar/elixir-school,ElixirVietnam/elixir-school,nscyclone/elixir-school,nscyclone/elixir-school,ElixirVietnam/elixir-school,doomspork/elixir-school,yuriibodarev/elixir-school,doomspork/elixir_school,nscyclone/elixir-school,psantos10/elixir-school,huydx/elixir-school,doomspork/elixir_school