Add translation for observation strings

I doubted translate observation by:
1) Observación
2) Muestra
3) Anotación
I do not what is more natural in Spanish.
Merge pull request #431 from stripTM/patch-2

Update Spanish translation (@stripTM)
Remove batch processing logic from Reporter
Merge pull request #433 from illarionov/removeBatchLogic

Remove batch processing logic from Reporter (@illarionov)
Optional gzip on submit.

Fixes #406.
Merge pull request #434 from tamcap/gzip_submit

Compress uploads using gzip (@tamcap)