Various feedback items

- Add logger call on theme install failure
- Add todo in Module\Admin\DBSync

src/Core/Theme.php

@@ -177,6 +177,7 @@ class Theme
 
 			return true;
 		} catch (\Exception $e) {
+			Logger::error('Theme installation failed', ['theme' => $theme, 'error' => $e->getMessage()]);
 			return false;
 		}
 	}

src/Module/Admin/DBSync.php

@@ -36,6 +36,7 @@ class DBSync extends BaseAdminModule
 
 		if ($a->argc > 2) {
 			if ($a->argv[2] === 'check') {
+				// @TODO Seems like a similar logic like Update::check()
 				$retval = DBStructure::update($a->getBasePath(), false, true);
 				if ($retval === '') {
 					$o .= L10n::t("Database structure update %s was successfully applied.", DB_UPDATE_VERSION) . "<br />";