Translations and i18n (#60)

* Managing i18n

* Fix absolute path

* Config files

* Home link manage langage

* Fixing footer i18n

* Implemented i18n on newsletter

* Implemented two languages in example

* Removed old section directory

* Using yaml in data to organize home summary

* Fully working for old versions without i18n

* Integrating language menu CSS

* Fix language dropdown CSS

* Refactor translation codes

* Remove duplicate code

* Fix URL issues

* Move customMenus and other site related config into data section

* Fix error during language toggle

* Only show the available translation for the posts

* Handle navbar brand URL properly

* Fix responsiveness

Co-authored-by: Hugo MARTIN <hugo.martin.69@gmail.com>
Co-authored-by: hossainemruz <emruz@appscode.com>

layouts/partials/navigators/lang-selector.html

@@ -0,0 +1,14 @@
+<li class="nav-item dropdown">
+<a class="nav-link dropdown-toggle" href="#" id="languageSelector" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+    <img class="flag" src="https://www.countryflags.io/{{ partial "helpers/country-code.html" .Language }}/flat/16.png">
+    {{ .Site.Language.LanguageName }}
+</a>
+<div class="dropdown-menu" aria-labelledby="languageSelector">
+    {{ range $.Site.Home.AllTranslations }}
+    <a class="dropdown-item nav-link languages-item" href="{{ .Permalink }}">
+        <img class="flag" src="https://www.countryflags.io/{{ partial "helpers/country-code.html" .Language }}/flat/24.png">
+        {{ .Language.LanguageName }}
+    </a>
+    {{ end }}
+</div>
+</li>