[FIX] web_editor: translate and add translations for placeholders

Reproduction:
1. Switch to French, create a /heading 1, and input nothing
2. The placeholder “Heading 1” is not translated

Fix: add translate function around the terms and manually add the
translations in pot

Note: since OdooEditor.js is under web_editor/static/lib/web-editor,
only the js code under /static/src/ is considered for translation export
The translation is manually added with specific path. In Odoo 16, the
path is changed to /static/src/ and translations can be exported
correctly. The translation code paths added here should be changed in
Odoo 16

Related PR adding translations: https://github.com/odoo/odoo/pull/93272

opw-3224482

closes odoo/odoo#117142

X-original-commit: 5f297854348e073a3915bca5cec13066f6abe90e
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/web_editor/i18n/web_editor.pot

@@ -1070,6 +1070,13 @@ msgstr ""
 msgid "Embed the youtube video in the document"
 msgstr ""
 
+#. module: web_editor
+#. odoo-javascript
+#: code:addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js:0
+#, python-format
+msgid "Empty quote"
+msgstr ""
+
 #. module: web_editor
 #. odoo-javascript
 #: code:addons/web_editor/static/src/js/common/ace.js:0
@@ -1311,6 +1318,27 @@ msgstr ""
 msgid "Heading 3"
 msgstr ""
 
+#. module: web_editor
+#. odoo-javascript
+#: code:addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js:0
+#, python-format
+msgid "Heading 4"
+msgstr ""
+
+#. module: web_editor
+#. odoo-javascript
+#: code:addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js:0
+#, python-format
+msgid "Heading 5"
+msgstr ""
+
+#. module: web_editor
+#. odoo-javascript
+#: code:addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js:0
+#, python-format
+msgid "Heading 6"
+msgstr ""
+
 #. module: web_editor
 #: model_terms:ir.ui.view,arch_db:web_editor.snippet_options_background_options
 msgid "Height"
@@ -1716,6 +1744,14 @@ msgstr ""
 msgid "Link to"
 msgstr ""
 
+#. module: web_editor
+#. odoo-javascript
+#: code:addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js:0
+#: code:addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js:0
+#, python-format
+msgid "List"
+msgstr ""
+
 #. module: web_editor
 #. odoo-javascript
 #: code:addons/web_editor/static/src/components/media_dialog/file_selector.xml:0
@@ -2903,6 +2939,13 @@ msgid ""
 "reload the page."
 msgstr ""
 
+#. module: web_editor
+#. odoo-javascript
+#: code:addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js:0
+#, python-format
+msgid "To-do"
+msgstr ""
+
 #. module: web_editor
 #: model_terms:ir.ui.view,arch_db:web_editor.snippet_options_image_optimization_widgets
 msgid "Toaster"

addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js

@@ -3871,16 +3871,16 @@ export class OdooEditor extends EventTarget {
         }
 
         const selectors = {
-            BLOCKQUOTE: 'Empty quote',
-            H1: 'Heading 1',
-            H2: 'Heading 2',
-            H3: 'Heading 3',
-            H4: 'Heading 4',
-            H5: 'Heading 5',
-            H6: 'Heading 6',
-            'UL LI': 'List',
-            'OL LI': 'List',
-            'CL LI': 'To-do',
+            BLOCKQUOTE: this.options._t('Empty quote'),
+            H1: this.options._t('Heading 1'),
+            H2: this.options._t('Heading 2'),
+            H3: this.options._t('Heading 3'),
+            H4: this.options._t('Heading 4'),
+            H5: this.options._t('Heading 5'),
+            H6: this.options._t('Heading 6'),
+            'UL LI': this.options._t('List'),
+            'OL LI': this.options._t('List'),
+            'CL LI': this.options._t('To-do'),
         };
 
         for (const hint of this.editable.querySelectorAll('.oe-hint')) {