Revision of introduction - pt
revision of begginer - pt
Revision of Index - pt
partial revision - starting with OSM - pt
Merge pull request #50 from hotosm/french

French translation - Traduction Françes
Merge pull request #49 from willemarcel/gh-pages

Partial revision of PT translation
add 404.html that redirects to /en/404.html, the users can switch language from there
Merge branch 'gh-pages' of github.com:hotosm/learnosm into gh-pages
Use proper hot URL in contribute
Fix Arial -> Aerial. Thanks simonpoole.
correct permalink structure in _config.yml
fix permalinks in english posts
fix permalinks in bi posts
fix permalinks in jp posts
fix permalinks in pt posts
fix permalinks in it posts
fix permalinks in templates
change example in CONTRIBUTING.md
resize image icons
More icon resize