add new translation for chapter 2
[vi] Update chapter 2
Translating "dumb protocol"

uncompleted
Translated "dumb protocol"
Translated "smart protocol"
Translating "uploading data"
Translated "uploading data"
Translated downloading data
Translating "Maintenance and Recovery Data"
Translating
Completed translation of "maintenance"
Translated "Data recovery"
Translating "Removing Objects"
Translating "Removing objects"
Translating "Removing objects"

still working on it
Fast review of chapter 8
[vi] First commit of the new year
Merge pull request #598 from daftano/master

[it] update 01-chapter9.markdown
Reviewed title for Plumbing and Porcelain

Perché nel testo si fa riferimento ai termini inglesi, e anche perché il titolo letto così sembra estraneo al contesto
Fixed "downloading data" title

typo