fixes #5652

Update start-installation.md

Falta un comando para que la instalación no falle

Translate structure-application-components to pt-BR

Merge branch 'master' of git://github.com/yiisoft/yii2 into pt-br-structure-application-components.md

Translate guide/structure-application to pt-BR

Fixes #4457: Added support for using noscript for css files registered through asset bundles and Html helper

Fixes #5587: `json_encode` is now used with `JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE` where it makes sense, also it is now default for `Json::encode()`

Fixes #5402: Debugger was not loading when there were closures, resources or PDO instances in the logged data

[skip ci] structure-entry-scripts and structure-overview PT-BR translation

Add new word conventions to PT-BR translation workflow and break its paragraphs for better readability

update caching-overview.md [skip ci]

Updated version of fxp/composer-asset-plugin in installation guide after testing new version. It's faster!

Fixes #5598: added ImageMagick with PNG and GD with FreeType checks to requirements of basic and advanced applications, used better Captcha exception message

update caching-fragment.md [skip ci]

to avoid issues about 404 links in the guide

Docs ja 2014 10 18

make sure to not confuse extending of helper classes with extensions.
Use "customizing" in this case and added note about when this should be done.