Hey Francisco,
Yes, you can remove the powered by statement - just edit the template.
You can do this directly from the backend. Go to the settings tab, open the settigns -> layout -> select to copy the template, click apply -> and after that select the option to modify the copied template and remove the copyright tag from it.
About
SECURITY
YOUR_CONTACT_DETAILS
JOOMLACOMMENT_NOTIFY_PUBLISH_SUBJECT
You will have to edit your language file.
You will need to translate those things:
JOOMLACOMMENT_NOTIFY_NEW_SUBJECT=NewComment:{title} [from:{name}][notify:{notify}]
JOOMLACOMMENT_NOTIFY_NEW_MESSAGE=<p>A user has posted a new comment to a content item you have subscribed <br />in <a href="{livesite}">{livesite}</a>:</p><p><b>Name: </b>{name}<br /><b>Title: </b>{title}<br /><b>Text: </b>{comment}<br /><b>Content item: </b><a href="{linkURL}">{linkURL}</a></p><p>Please do not respond to this message as it is automatically generated and is for information purposes only.</p><p>To unsubscribe to this content item :<br />- if you are a registered user : logon, go to the post and edit this post to modify the notify value<br />- if you are an unregistered user : add a new post setting again your email but with "do not notify" value</p>
JOOMLACOMMENT_NOTIFY_TOBEAPPROVED_SUBJECT=ToBeApproved:{title} [from:{name}][notify:{notify}]
JOOMLACOMMENT_NOTIFY_TOBEAPPROVED_MESSAGE=<p>A user has posted a new comment and must be approved <br />in <a href="{livesite}">{livesite}</a>:</p><p><b>Name: </b>{name}<br /><b>Title: </b>{title}<br /><b>Text: </b>{comment}<br /><b>Content item: </b><a href="{linkURL}">{linkURL}</a></p><p>Please do not respond to this message as it is automatically generated and is for information purposes only.</p>
JOOMLACOMMENT_NOTIFY_EDIT_SUBJECT=EditedComment:{title} [from:{name}][notify:{notify}]
JOOMLACOMMENT_NOTIFY_EDIT_MESSAGE=<p>A user has edited a comment of the content item you have subscribed <br />in {livesite}:</p><p><b>Name: </b>{name}<br /><b>Title: </b>{title}<br /><b>Text: </b>{comment}<br /><b>Content item: </b><a href="{linkURL}">{linkURL}</a></p><p>Please do not respond to this message as it is automatically generated and is for information purposes only.</p><p>To unsubscribe to this content item :<br />- if you are a registered user : logon, go to the post and edit this post to modify the notify value<br />- if you are an unregistered user : add a new post setting again your email but with "do not notify" value</p>
JOOMLACOMMENT_NOTIFY_PUBLISH_SUBJECT=PublishedComment:{title} has been published
JOOMLACOMMENT_NOTIFY_PUBLISH_MESSAGE=<p>The following comment has been published <br />from <a href="{livesite}">{livesite}</a>:</p><p><b>Name: </b>{name}<br /><b>Title: </b>{title}<br /><b>Text: </b>{comment}<br /><b>Content item: </b><a href="{linkURL}">{linkURL}</a></p><p>Please do not respond to this message as it is automatically generated and is for information purposes only.</p>
JOOMLACOMMENT_NOTIFY_UNPUBLISH_SUBJECT=UnpublishedComment:{title} has been UNpublished
JOOMLACOMMENT_NOTIFY_UNPUBLISH_MESSAGE=<p>The following comment has been UNpublished <br />from <a href="{livesite}">{livesite}</a>:</p><p><b>Name: </b>{name}<br /><b>Title: </b>{title}<br /><b>Text: </b>{comment}<br /><b>Content item: </b><a href="{linkURL}">{linkURL}</a></p><p>Please do not respond to this message as it is automatically generated and is for information purposes only.</p>
JOOMLACOMMENT_NOTIFY_DELETE_SUBJECT=DeletedComment:{title} has been deleted
JOOMLACOMMENT_NOTIFY_DELETE_MESSAGE=<p>The following comment has been deleted <br />from <a href="{livesite}">{livesite}</a>:</p><p><b>Name: </b>{name}<br /><b>Title: </b>{title}<br /><b>Text: </b>{comment}<br /><b>Content item: </b><a href="{linkURL}">{linkURL}</a></p><p>Please do not respond to this message as it is automatically generated and is for information purposes only.</p>
SECURITY=Security
YOUR_CONTACT_DETAILS=Your Contact Details
Actually look at the english language file located in language/en-GB/en-GB.com_comment.ini
then compare it with your english file (is it spanish?)
You can disable the ubb code from the backend. There is an option for this.
Sorry about the inconvenience, but we rely on user translations. I cannot know all languages in the world. If you translate the file and share it with me I promise to extend you subscription
Cheers,
Daniel