Change all function L10n calls to one underscore, test updates

That change is done to be compatible with the phpmyadmin translator
class so this can be a drop in replacement or other way around.

Update smarty block.t to only check for _* functions and not any pre
loaded language class

www/lib/CoreLibs/Language/L10n.php

@@ -14,7 +14,7 @@
 *	__  : returns string (translated or original if not found)
 *	__n : plural string
 *   __p : string with context
-*   __pb: string with context and plural
+*   __np: string with context and plural
 *
 * HISTORY:
 * 2022/4/15  (cs) drop all old folder layout support, new folder base