sync with english version
Correction of Czech translation
Redundant comma
Semicolons to dots.
Redundant comma
Simplify.
CSS
Merge pull request #1 from yetty/patch-1

Correction of Czech translation
translated keep-alive tip
Added spanish translation for keep-alive
Added spanish translation for keep-alive
japanese translation
French translation for PR #230
Merge pull request #233 from yetty/master

Corrections of Czech translation.
Merge pull request #237 from nicoespeon/master

French translation for PR #230.

Thanks for your contribution.
Merge pull request #235 from todvora/master

Czech translation of Keep-alive server tip
#234 source formatting
Merge branch 'pull-request-234'
Merge branch 'pull-request-232'

Conflicts:
	src/documents/jquery/pl/use-for-instead-of-each.html.md
rename keep-alive