PLT-7: Refactoring stores to use translations (chunk 7)

- Add spanish translations

api/team.go

@@ -494,7 +494,7 @@ func inviteMembers(c *Context, w http.ResponseWriter, r *http.Request) {
 
 	var invNum int64 = 0
 	for i, invite := range invites.Invites {
-		if result := <-Srv.Store.User().GetByEmail(c.Session.TeamId, invite["email"]); result.Err == nil || result.Err.Message != store.MISSING_ACCOUNT_ERROR {
+		if result := <-Srv.Store.User().GetByEmail(c.Session.TeamId, invite["email"]); result.Err == nil || result.Err.Id != store.MISSING_ACCOUNT_ERROR {
 			invNum = int64(i)
 			c.Err = model.NewLocAppError("invite_members", "api.team.invite_members.already.app_error", nil, strconv.FormatInt(invNum, 10))
 			return