Hello!

Continuing the theme of translations. (request #13742)

Adding a new language breaks the main page.

codendi_syslog content:

2019-08-14T07:58:18+02:00 [120] [error] Caught exception: Unknown variable: purified_headline:
#0 /usr/share/tuleap/src/vendor/mustache/mustache/src/Mustache/Context.php(102): Mustache_Context->findVariableInStack('purified_headli...', Array)
#1 /var/tmp/tuleap_cache/template_engine/__Mustache_796b36b7131597faee134724ffea89a9.php(60): Mustache_Context->find('purified_headli...')
#2 /usr/share/tuleap/src/vendor/mustache/mustache/src/Mustache/Template.php(72): __Mustache_796b36b7131597faee134724ffea89a9->renderInternal(Object(Mustache_Context))
#3 /usr/share/tuleap/src/vendor/mustache/mustache/src/Mustache/Engine.php(244): Mustache_Template->render(Object(Tuleap\Theme\BurningParrot\HomePagePresenter))
#4 /usr/share/tuleap/src/common/templating/mustache/MustacheRenderer.class.php(65): Mustache_Engine->render('homepage', Object(Tuleap\Theme\BurningParrot\HomePagePresenter))
#5 /usr/share/tuleap/src/common/templating/TemplateRenderer.class.php(63): MustacheRenderer->renderToString('homepage', Object(Tuleap\Theme\BurningParrot\HomePagePresenter))
#6 /usr/share/tuleap/src/common/layout/SiteHomepageController.php(142): TemplateRenderer->renderToPage('homepage', Object(Tuleap\Theme\BurningParrot\HomePagePresenter))
#7 /usr/share/tuleap/src/common/layout/SiteHomepageController.php(97): Tuleap\Layout\SiteHomepageController->displayStandardHomepage(true, '', true)
#8 /usr/share/tuleap/src/common/Request/FrontRouter.php(232): Tuleap\Layout\SiteHomepageController->process(Object(HTTPRequest), Object(Tuleap\Theme\BurningParrot\BurningParrotTheme), Array)
#9 /usr/share/tuleap/src/common/Request/FrontRouter.php(89): Tuleap\Request\FrontRouter->routeHandler(Object(HTTPRequest), Object(Tuleap\Layout\SiteHomepageController), Array)
#10 /usr/share/tuleap/src/www/index.php(46): Tuleap\Request\FrontRouter->route(Object(HTTPRequest))
#11 {main}

For other screens did not find problems.

Tuleap version: 11.4.99.136