Add some links to the video pages from the home page

We will probably want to revert this commit and do this with a new
link style in the future.

Right now this involves copying images and article titles cross
repo from getting-started-docs to here, and translating them over
again. Which is nasty and what would be solved by a new link style.

But we want the thumbs in this release, so we'll do it like this
for now.
[endlessm/eos-shell#4073]
Merge pull request #7 from endlessm/shell/4073

Add some links to the video pages from the home page
Updated translations from transifex

For the new video thumbnails on the home page of the help docs
Use Spanish content for Portuguese

Our Portuguese translation are not updated and would be half in
English. Spanish is a better substitute for now.

Symlinked the portuguses po file to point to the spanish location and
updated our tx config to update a dummy file with the portuguese translations.

This should all be reverted later.
[endlessm/eos-shell#4064]