diff --git a/addons/mail/static/src/components/discuss/tests/discuss_moderation_tests.js b/addons/mail/static/src/components/discuss/tests/discuss_moderation_tests.js
index 2a0f5679349..c9d954ca895 100644
--- a/addons/mail/static/src/components/discuss/tests/discuss_moderation_tests.js
+++ b/addons/mail/static/src/components/discuss/tests/discuss_moderation_tests.js
@@ -536,9 +536,7 @@ QUnit.test('reject pending moderation message (reject with explanation)', async
     );
     assert.strictEqual(
         dialog.querySelector('.modal-title').textContent,
-        // TODO FIXME, this should be a proper title "Send explanation to author"
-        // see https://github.com/odoo/owl/issues/670
-        "[object Object]",
+        "Send explanation to author",
         "dialog should have correct title"
     );
 
@@ -694,14 +692,12 @@ QUnit.test('discard pending moderation message (reject without explanation)', as
     );
     assert.strictEqual(
         dialog.querySelector('.modal-title').textContent,
-        // TODO FIXME, this should be a proper title "Confirmation"
-        // see https://github.com/odoo/owl/issues/670
-        "[object Object]",
+        "Confirmation",
         "dialog should have correct title"
     );
     assert.strictEqual(
         dialog.textContent,
-        "[object Object]×You are going to discard 1 message.Do you confirm the action?DiscardCancel",
+        "Confirmation×You are going to discard 1 message.Do you confirm the action?DiscardCancel",
         "should warn the user on discard action"
     );
 
diff --git a/addons/mail/static/src/components/moderation_ban_dialog/moderation_ban_dialog.js b/addons/mail/static/src/components/moderation_ban_dialog/moderation_ban_dialog.js
index ec260829cf4..2880c1747bb 100644
--- a/addons/mail/static/src/components/moderation_ban_dialog/moderation_ban_dialog.js
+++ b/addons/mail/static/src/components/moderation_ban_dialog/moderation_ban_dialog.js
@@ -42,6 +42,13 @@ class ModerationBanDialog extends Component {
         return this.props.messageLocalIds.map(localId => this.env.models['mail.message'].get(localId));
     }
 
+    /**
+     * @returns {string}
+     */
+    get CONFIRMATION() {
+        return this.env._t("Confirmation");
+    }
+
     //--------------------------------------------------------------------------
     // Handlers
     //--------------------------------------------------------------------------
diff --git a/addons/mail/static/src/components/moderation_ban_dialog/moderation_ban_dialog.xml b/addons/mail/static/src/components/moderation_ban_dialog/moderation_ban_dialog.xml
index d0bc59c19a6..5b8f540aa9d 100644
--- a/addons/mail/static/src/components/moderation_ban_dialog/moderation_ban_dialog.xml
+++ b/addons/mail/static/src/components/moderation_ban_dialog/moderation_ban_dialog.xml
@@ -2,8 +2,7 @@
 <templates xml:space="preserve">
     <t t-name="mail.ModerationBanDialog" owl="1">
         <div><!-- TODO FIXME necessary div for useRef, can be removed at next owl update, see https://github.com/odoo/owl/issues/638 -->
-        <t t-set="title">Confirmation</t>
-        <Dialog contentClass="'o_ModerationBanDialog'" title="title" size="'medium'" t-ref="dialog">
+        <Dialog contentClass="'o_ModerationBanDialog'" title="CONFIRMATION" size="'medium'" t-ref="dialog">
             <t t-if="messages.length === 1">
                 <p>You are going to ban the following user:</p>
             </t>
diff --git a/addons/mail/static/src/components/moderation_discard_dialog/moderation_discard_dialog.js b/addons/mail/static/src/components/moderation_discard_dialog/moderation_discard_dialog.js
index 597d2ac3262..5f6a906df46 100644
--- a/addons/mail/static/src/components/moderation_discard_dialog/moderation_discard_dialog.js
+++ b/addons/mail/static/src/components/moderation_discard_dialog/moderation_discard_dialog.js
@@ -57,6 +57,13 @@ class ModerationDiscardDialog extends Component {
         );
     }
 
+    /**
+     * @returns {string}
+     */
+    get CONFIRMATION() {
+        return this.env._t("Confirmation");
+    }
+
     //--------------------------------------------------------------------------
     // Handlers
     //--------------------------------------------------------------------------
diff --git a/addons/mail/static/src/components/moderation_discard_dialog/moderation_discard_dialog.xml b/addons/mail/static/src/components/moderation_discard_dialog/moderation_discard_dialog.xml
index 13cafb0f047..32458c6db58 100644
--- a/addons/mail/static/src/components/moderation_discard_dialog/moderation_discard_dialog.xml
+++ b/addons/mail/static/src/components/moderation_discard_dialog/moderation_discard_dialog.xml
@@ -2,8 +2,7 @@
 <templates xml:space="preserve">
     <t t-name="mail.ModerationDiscardDialog" owl="1">
         <div><!-- TODO FIXME necessary div for useRef, can be removed at next owl update, see https://github.com/odoo/owl/issues/638 -->
-        <t t-set="title">Confirmation</t>
-        <Dialog contentClass="'o_ModerationDiscardDialog'" title="title" size="'medium'" t-ref="dialog">
+        <Dialog contentClass="'o_ModerationDiscardDialog'" title="CONFIRMATION" size="'medium'" t-ref="dialog">
             <p t-esc="getText()"/>
             <p>Do you confirm the action?</p>
             <t t-set-slot="buttons">
diff --git a/addons/mail/static/src/components/moderation_reject_dialog/moderation_reject_dialog.js b/addons/mail/static/src/components/moderation_reject_dialog/moderation_reject_dialog.js
index 95f90e42c7d..675e3e48d8e 100644
--- a/addons/mail/static/src/components/moderation_reject_dialog/moderation_reject_dialog.js
+++ b/addons/mail/static/src/components/moderation_reject_dialog/moderation_reject_dialog.js
@@ -48,6 +48,13 @@ class ModerationRejectDialog extends Component {
         );
     }
 
+    /**
+     * @returns {string}
+     */
+    get SEND_EXPLANATION_TO_AUTHOR() {
+        return this.env._t("Send explanation to author");
+    }
+
     //--------------------------------------------------------------------------
     // Handlers
     //--------------------------------------------------------------------------
diff --git a/addons/mail/static/src/components/moderation_reject_dialog/moderation_reject_dialog.xml b/addons/mail/static/src/components/moderation_reject_dialog/moderation_reject_dialog.xml
index a908265d33b..2b174a881fb 100644
--- a/addons/mail/static/src/components/moderation_reject_dialog/moderation_reject_dialog.xml
+++ b/addons/mail/static/src/components/moderation_reject_dialog/moderation_reject_dialog.xml
@@ -2,8 +2,7 @@
 <templates xml:space="preserve">
     <t t-name="mail.ModerationRejectDialog" owl="1">
         <div><!-- TODO FIXME necessary div for useRef, can be removed at next owl update, see https://github.com/odoo/owl/issues/638 -->
-        <t t-set="title">Send explanation to author</t>
-        <Dialog contentClass="'o_ModerationRejectDialog'" title="title" size="'medium'" t-ref="dialog">
+        <Dialog contentClass="'o_ModerationRejectDialog'" title="SEND_EXPLANATION_TO_AUTHOR" size="'medium'" t-ref="dialog">
             <input class="o_ModerationRejectDialog_title form-control" type="text" placeholder="Subject" autofocus="autofocus" t-model="state.title"/>
             <textarea class="o_ModerationRejectDialog_comment form-control mt16" placeholder="Mail Body" t-model="state.comment"/>
             <t t-set-slot="buttons">