Offer an online method to search the Wall for a string

[loolmeh]

Offer an online method to search the Wall for a string.
AlanF_US, Wall

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Original ticket: https://www.assembla.com/spaces/tatoeba2/tickets/402

[trang]

Just like for private messages (#37), implementing a full text search would be too much effort. We will have to rely on Google or other Web search engines to do that job for us.

With Google it's possible to restrict a search to a specific website under a specifc URL with the "site" filter. For instance searching for "tags" on the Wall would look like this: site:tatoeba.org/*/wall tags

We don't have full control about it. For instance, I'm not sure how often Google is indexing our Wall and I doubt every post is being indexed. But for that we could do some SEO.

In the worst case, the Wall content is being exported weekly. If someone needs to dig into the past, they can still do it offline.