Add tr_sequence on res.lang to allow sorting languages in the translation dialog

web_translate_dialog/__manifest__.py

@@ -18,7 +18,8 @@
         "web",
     ],
     "data": [
-        "view/web_translate.xml",
+        "views/res_lang.xml",
+        "views/web_translate.xml",
     ],
     "qweb": [
         "static/src/xml/base.xml",

web_translate_dialog/models/__init__.py

@@ -0,0 +1,2 @@
+from . import base
+from . import res_lang

web_translate_dialog/models/res_lang.py

@@ -0,0 +1,14 @@
+# Copyright 2019 Camptocamp SA
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl)
+from odoo import models, fields
+
+
+class ResLang(models.Model):
+
+    _inherit = 'res.lang'
+
+    tr_sequence = fields.Integer(
+        string='Translation sequence',
+        help='Defines the order of language to appear in translation dialog',
+        default=10,
+    )

web_translate_dialog/static/src/js/web_translate_dialog.js

@@ -29,15 +29,16 @@ var translateDialog = Dialog.extend({
         this.view_language = session.user_context.lang;
         this.view = parent;
         this.view_type = parent.viewType || '';
-        this.$view_form = null;
-        this.$sidebar_form = null;
         this.translatable_field = options.field.fieldName;
         this.res_id = options.res_id;
         this.languages = null;
         this.languages_loaded = $.Deferred();
-        (new data.DataSetSearch(this, 'res.lang', parent.searchView.dataset.get_context(),
-                                [['translatable', '=', '1']])).read_slice(['code', 'name'],
-                                { sort: 'id' }).then(this.on_languages_loaded);
+        this.lang_data = new data.DataSetSearch(
+            this, 'res.lang', parent.searchView.dataset.get_context(),
+            [['translatable', '=', '1']]
+        );
+        this.lang_data.set_sort(['tr_sequence asc','id asc']);
+        this.lang_data.read_slice(['code', 'name']).then(this.on_languages_loaded);
     },
     willStart: function () {
         var self = this;

web_translate_dialog/views/res_lang.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+    <record id="res_lang_form" model="ir.ui.view">
+        <field name="name">res.lang.form.inherit</field>
+        <field name="inherit_id" ref="base.res_lang_form" />
+        <field name="model">res.lang</field>
+        <field name="arch" type="xml">
+            <field name="translatable" position="after">
+                <field name="tr_sequence" attrs="{'invisible': [('translatable', '!=', True)]}" />
+            </field>
+        </field>
+    </record>
+</odoo>