The important parts have been updated* and the missing parts added according to my best knowledge.
*admincmd.txr was UTF8 instead of UTF8 without BOM, I'm not sure it was a mistake or not.
* AdminHelp: Use semicolon everywhere
* AdminHelp: Translate amx_help description
* AdminHelp: Use the available ADMIN_ALL define in register_concmd
* AdminHelp: Bind the cvars
* AdminHelp: Replace %L by %l
* AdminHelp: Remove task only when necessary
* AdminHelp: Reorder some lines to prepare next commit
* AdminHelp: Use read_arg_int() on the first argument and clamp the value
* AdminHelp: Use read_arg_int() on the second argument and clamp the value
* AdminHelp: Rename few variables and callback
* AdminHelp: Use constants for buffers max length
* AdminHelp: Add amx_searchcmd command, and update the multilingual file
* AdminHelp: Adjust spacing a little for readability
* AdminHelp: Add amx_help_display_msg_time cvar
* AdminHelp: Add the new command in the help message (and fix missing return)
* AdminHelp: Add a check if provided entry no. goes above the total found entries
* AdminHelp: Don't show the help message for begin if all commands are already displayed
* AdminHelp: Make sure the server command use amx_help_amount_per_page value
