[FIX] web: add missing aria-label to button that opens developer tools

When the debug manager was migrated to OWL on ce559992, both `title`
and `aria-label` attributes were removed from the button that opens the
developer tools. However, the `aria-label` is actually required, because
such button doesn't contain any text, just the bug icon.

This commit restores (only) the `aria-label`text.

closes odoo/odoo#139630

X-original-commit: aefeb337f132d43f6ee3d5a9fc5bf4b6ef0af454
Signed-off-by: Luca Vitali (luvi) <luvi@odoo.com>

addons/web/i18n/web.pot

@@ -3766,6 +3766,13 @@ msgstr ""
 msgid "Open View"
 msgstr ""
 
+#. module: web
+#. odoo-javascript
+#: code:addons/web/static/src/core/debug/debug_menu.xml:0
+#, python-format
+msgid "Open developer tools"
+msgstr ""
+
 #. module: web
 #. odoo-javascript
 #: code:addons/web/static/src/views/fields/relational_utils.js:0

addons/web/static/src/core/debug/debug_menu.xml

@@ -9,7 +9,7 @@
           autoOpen="false"
         >
             <t t-set-slot="toggler">
-                <i class="fa fa-bug"/>
+                <i class="fa fa-bug" role="img" aria-label="Open developer tools"/>
             </t>
             <t t-foreach="elements" t-as="element" t-key="element_index">
                 <DropdownItem