[UK][Blog] Adding TOC file, enabling UK version in Viewer, 2 chapters
[UK][Blog] Finishing 1st section
addtional -> additional

fixed a typo
Merge pull request #2020 from tomtomsen/patch-1

addtional -> additional
Merge branch 'master' of git://github.com/yiisoft/yii into uk_docs
[UK][Blog] Typos in section 1, adding section 2
Merge pull request #2022 from yiiframework-com-ua/uk_docs

[Uk][Blog] TOC, 1 and 2 sections

[ci skip]