[frontend] Fix custom app mako generation
@@ -33,7 +33,7 @@ ${'<%'}def name="menubar(section='')">
<ul class="nav">
<li class="app-header">
<a href="/${app_name}">
- <img src="${"${"} static('${app_name}/art/icon_${app_name}_48.png') }" class="app-icon" alt="${ _('App icon') }"/>
+ <img src="${"${"} static('${app_name}/art/icon_${app_name}_48.png') }" class="app-icon" alt="${"${"} _('App icon') }"/>
${" ".join(word.capitalize() for word in app_name.split("_"))}
</a>
</li>
