With WP Posts Filter you can display posts of certain categories and tags in a page.
Plugin home page: http://olezhek.net/codez/wp-posts-filter/
Plugin mirror repo: https://bitbucket.org/olezhek/wp-posts-filter/
Any comments/suggestions/ideas on this plugin would be appreciated.
If you want to create a translation for this plugin, you can use wp-posts-filter.pot file as the starting point (located in the root directory of the plugin). More info about plugin internationalization could be found here. Contact me if you want to add a translation for your language to this plugin.