Better wording

Refomulated for better understanding
Merge pull request #511 from Reizinixc/th

[th] Retranslate README file
nl: Fixed some typo's in chapter 8
nl: Chapter 8: Made some sentences more fluent.
Merge pull request #512 from Jopie64/master

Some changes in the Dutch translation
Fixed a few obvious spelling, grammar, punctuation and capitalization errors in the branching
chapter of the German translation.
Merge pull request #513 from Brackmeister/master

Some fixes to the German translation
Second version of the patch (беспорядок => путаница)
Merge pull request #504 from tendium/patch-1

Better wording
Fix typo. trços -> traços.
Merge pull request #516 from deniscostadsc/master

Fix typo. trços -> traços.
enable parallel check of languages

Use parallel to spawn as many subprocesses as possible to accelerate
the tests.
Correct stylistic issues in Russian translation
Merge pull request #517 from GArik/RU

Correct some parts in Russian translation v2
Change Maruku check to fully functional mode

this is cleans up the code.
Force output of Rake messages to stderr
fix duplicated typo "...fez o rebase do seu do seu trabalho..."
Merge pull request #519 from masakik/patch-1

fix duplicated typo "...fez o rebase do seu do seu trabalho..."
[zh] fix branch name half translate to chinese
[ko] translation update

[ko] translation update ch1 to ch4

[ko] translation update ch5

[ko] translation update ch6

[ko] translation update ch7

[ko] translation update ch8

[ko] translation update ch9

[ko] proofreading.

[ko] fix mistyping.