Address review feedback on portal i18n

Swallow locale mutation rejections after the toast, close the
mobile drawer on locale change, escape SEO paths, share the
IAM locale list with SEO, and finish dropping /trust leftovers.

Signed-off-by: Émile Ré <emile@probo.com>

pkg/server/api/complianceportal/v1/seo_test.go

@@ -60,3 +60,20 @@ func TestSEOFromRequest(t *testing.T) {
 	assert.Equal(t, "https://acme.probopage.localhost/en/documents", enHref)
 	assert.Equal(t, enHref, xDefault)
 }
+
+func TestSEOFromRequest_EscapesPathSegments(t *testing.T) {
+	t.Parallel()
+
+	req, err := http.NewRequest(
+		http.MethodGet,
+		"https://acme.probopage.localhost/en/docs/foo%20bar",
+		nil,
+	)
+	require.NoError(t, err)
+
+	_, canonical, _ := complianceportal_v1.SEOFromRequest(
+		req,
+		"https://acme.probopage.localhost",
+	)
+	assert.Equal(t, "https://acme.probopage.localhost/en/docs/foo%20bar", canonical)
+}