add help for :colorscheme and move completion function to

completion.colorScheme

locale/en-US/autocommands.txt

@@ -21,6 +21,7 @@ Available {events}:
 
 `--------------------`----------------------------------------
 *BookmarkAdd*        Triggered after a page is bookmarked
+*ColorScheme*        Triggered after a color scheme has been loaded
 *DOMLoad*            Triggered when a page's DOM content has fully loaded
 *DownloadPost*       Triggered when a download has completed
 *LocationChange*     Triggered when changing tabs or when navigating to a new location

locale/en-US/index.txt

@@ -153,6 +153,7 @@ section:Ex{nbsp}commands[ex-cmd-index,:index]
 ||:cmap|| Map a key sequence in command-line mode +
 ||:cmapclear|| Remove all mappings in command-line mode +
 ||:cnoremap|| Map a key sequence without remapping keys in command-line mode +
+||:colorscheme|| Load a color scheme +
 ||:comclear|| Delete all user-defined commands +
 ||:command|| List and define commands +
 ||:cunabbrev|| Remove an abbreviation in command-line mode +

locale/en-US/styling.txt

@@ -7,6 +7,16 @@ styling is specified via CSS. Although you may style any user interface element
 via the [c]:style[c] command, most Vimperator elements can be styled with the
 [c]:highlight[c] command, for convenience.
 
+|E185| |:colo| |:colorscheme| +
+||:colo[rscheme] {name}|| +
+________________________________________________________________________________
+Load a color scheme. {name} is found by searching the 'runtimepath' for the
+first file matching colors/{name}.vimp.
+
+The ColorScheme autocommand is triggered after the color scheme has been
+sourced.
+________________________________________________________________________________
+
 |:hi| |:highlight| +
 ||:hi[light][!] [-append] {group}[{selector}] [{css}]|| +
 ________________________________________________________________________________