/download changes:

- Display mirror domain instead of an arbitrary index (which could change)
- Fix showing 404 page for non-existent mirror redirection links
- Move default mirror definition into downloads.py for easy changing

i2p2www/pages/global/macros

@@ -7,6 +7,7 @@
 {%- elif request.endpoint == 'blog_post' -%}{{ url_for('blog_post', lang=lang, slug=slug) }}
 {%- elif request.endpoint == 'meetings_show' -%}{{ url_for('meetings_show', lang=lang, id=id) }}
 {%- elif request.endpoint == 'downloads_select' -%}{{ url_for('downloads_select', lang=lang, version=version, file=file) }}
+{%- elif request.endpoint == 'downloads_redirect' -%}{{ url_for('site_show', lang=lang) }}
 {%- elif request.endpoint -%}{{ url_for(request.endpoint, lang=lang) }}
 {%- else -%}{{ url_for('site_show', lang=lang) }}
 {%- endif -%}