docs: move translation to a separate page

Start new tradition of putting it under docs/dev/

docs/dev/translation.rst

@@ -0,0 +1,2 b''
+.. _translations:
+.. include:: ./../../kallithea/i18n/how_to

docs/contributing.rst

@@ -155,9 +155,6 b' For now we just have one official branch'
 that it can be (and is) used in production. Experimental changes should live
 elsewhere (for example in a pull request) until they are ready.
 
-.. _translations:
-.. include:: ./../kallithea/i18n/how_to
-
 
 "Roadmap"
 ---------

docs/index.rst

@@ -53,6 +53,7 b' Kallithea Documentation'
    :maxdepth: 1
 
    contributing
+   dev/translation
    changelog
 
 **API**