Now also properly labels review.

The params should be processed in form, not further in the code.

Search is no longer performed on each request, but rather once and then
results are cached.

- correct message for no search results (issue #219)
- allows to go back in translated strings (issue #229)

Currently translated at 98.4% (775 of 788)

Uses PyICU if available, fallback to normal cmp in case it is not.

Currently translated at 57.9% (456 of 788)

Currently translated at 100.0% (788 of 788)

Currently translated at 100.0% (788 of 788)