Introduce support for 3rd-party auth (OAuth2 & LDAP)

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

priv/gettext/en/LC_MESSAGES/default.po

@@ -1177,12 +1177,12 @@ msgstr "If you didn't request this, please ignore this email."
 #, elixir-format, fuzzy
 #: lib/web/templates/email/email.text.eex:10
 msgid "In the meantime, please consider this the software as not (yet) finished. Read more on the Framasoft blog:"
-msgstr "In the meantime, please consider that the software is not (yet) finished. More information %{a_start}on our blog%{a_end}."
+msgstr "In the meantime, please consider that the software is not (yet) finished. More information on our blog."
 
 #, elixir-format, fuzzy
 #: lib/web/templates/email/email.text.eex:9
 msgid "Mobilizon is still under development, we will add new features along the updates, until the release of version 1 of the software in the fall of 2020."
-msgstr "Mobilizon is under development, we will add new features to this site during regular updates, until the release of %{b_start}version 1 of the software in the first half of 2020%{b_end}."
+msgstr "Mobilizon is under development, we will add new features to this site during regular updates, until the release of version 1 of the software in the first half of 2020."
 
 #, elixir-format, fuzzy
 #: lib/web/templates/email/email.text.eex:7

priv/repo/migrations/20200630123819_add_provider_to_user_and_make_password_mandatory.exs

@@ -0,0 +1,17 @@
+defmodule Mobilizon.Storage.Repo.Migrations.AddProviderToUserAndMakePasswordMandatory do
+  use Ecto.Migration
+
+  def up do
+    alter table(:users) do
+      add(:provider, :string, null: true)
+      modify(:password_hash, :string, null: true)
+    end
+  end
+
+  def down do
+    alter table(:users) do
+      remove(:provider)
+      modify(:password_hash, :string, null: false)
+    end
+  end
+end