Ya estoy manos a la obra pero tengo problemas... estoy atascaillo 
No entiendo esto:
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#-----[ OPEN ]------------------------------------------------
#
# Here we step back to the original version : lang keys have been moved into lang_extend_merge.php
#
language/lang_english/lang_main.php
#
#-----[ FIND ]------------------------------------------------
#
<?php
//-- mod : merge -----------------------------------------------------------------------------------
#
#-----[ REPLACE WITH ]----------------------------------------
#
<?php
#
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Cuando intento buscar lo que se me dice no lo encuentro. Incluso parece que se han equivocado y que está al reves...
¿Qué tengo que abrir el fichero "lang_extend_merge.php" o "lang_main.php"?
Lo siguiente si que ya no lo encuentro por ningún lado.
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#-----[ FIND ]------------------------------------------------
#
//-- mod : merge -----------------------------------------------------------------------------------
//-- add
$lang['Refresh'] = 'Refresh';
$lang['Merge_topics'] = 'Merge topics';
$lang['Merge_title'] = 'New topic title';
$lang['Merge_title_explain'] = 'This will be the new title of the final topic. Let it blank if you want the system to use the title of the destination topic';
$lang['Merge_topic_from'] = 'Topic to merge';
$lang['Merge_topic_from_explain'] = 'This topic will be merge to the other topic. You can input the topic id, the url of the topic, or the url of a post in this topic';
$lang['Merge_topic_to'] = 'Destination topic';
$lang['Merge_topic_to_explain'] = 'This topic will get all the posts of the precedent topic. You can input the topic id, the url of the topic, or the url of a post in this topic';
$lang['Merge_from_not_found'] = 'The topic to merge hasn\'t been found';
$lang['Merge_to_not_found'] = 'The destination topic hasn\'t been found';
$lang['Merge_topics_equals'] = 'You can\'t merge a topic with itself';
$lang['Merge_from_not_authorized'] = 'You are not a authorized to moderate topics coming from the forum of the topic to merge';
$lang['Merge_to_not_authorized'] = 'You are not a authorized to moderate topics coming from the forum of the destination topic';
$lang['Merge_poll_from'] = 'There is a poll on the topic to merge. It will be copied to the destination topic';
$lang['Merge_poll_from_and_to'] = 'The destination topic already has got a poll. The poll of the topic to merge will be deleted';
$lang['Merge_confirm_process'] = 'Are you sure you want to merge <br />"<b>%s</b>"<br />to<br />"<b>%s</b>"';
$lang['Merge_topic_done'] = 'The topics have been successfully merged.';
//-- fin mod : merge -------------------------------------------------------------------------------
//
#
#-----[ REPLACE WITH ]----------------------------------------
#
//
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Yo utilizo en mi foro el español, no el inglés, lo digo porque como se está haciendo la instalación en las carpetas "english" pues igual no veo las nuevas funciones instaladas.
, saludos.