You will get the following error:
PHP Fatal error: Uncaught exception 'Tuleap\\Language\\CustomContentNotFoundException' in /usr/share/tuleap/src/common/language/CustomizableContentLoader.
php:45\nStack trace:\n#0 /usr/share/tuleap/src/common/templating/mustache/SiteContentRenderer.php(49): Tuleap\\Language\\CustomizableContentLoader->getContent(Object(PFUser), 'widget/my_welco...')\n#1 /usr/share/tuleap/src/common/templating/mustache/SiteContentRenderer.php(73): Tuleap\\Templating\\Mustache\\SiteContentRenderer->render(Object(PFUser), 'widget/my_welco...', Array)\n#2 /usr/share/tuleap/src/common/widget/MyWelcomeMessage.php(65): Tuleap\\Templating\\Mustache\\SiteContentRenderer->renderMarkdown(Object(PFUser), 'widget/my_welco...', Array)\n#3 /usr/share/tuleap/src/common/Dashboard/Widget/DashboardWidgetPresenter.php(72): Tuleap\\Widget\\MyWelcomeMessage->getContent()\n#4 /usr/share/tuleap/src/common/Dashboard/Widget/DashboardWidgetPresenterBuilder.php(103): Tuleap\\Dashboard\\Widget\\DashboardWidgetPresenter->__construct(Object(Tuleap\\Dashboard\\User\\UserDashboard), Object(Tuleap\\Da in /usr/share/tuleap/src/common/language/CustomizableContentLoader.php on line 45, referer:
https://my.enalean.com/my/?dashboard_id=975
With the local.inc default it is not abnormal to encounter this situation, /usr/share/codendi (which is a link to /usr/share/tuleap) is used in sys_incdir and sys_custom_incdir parameters.