Visvanath Ratnaweera

Howard

When you say "how much memory he needs" you mean the gray and wobbly kind, right?

These are not simple questions. There is some documentation about these topics in the initial information of this (Hardware and performance) forum. Start a new discussion then you'll see them.

and writing history:
Microsoft and Nokia - a marriage made in hell?
http://www.bbc.com/news/technology-33481217

Moodle can not be downgraded. You need the last backup before the broken upgrade.

Moodle has a sophisticated language control. As already mentioned the site-level one is Site administration > Language > Language settings (what else? ;). Then each course can force the language. Finally each user can choose a language in his profile.

If your site need to be multilingual, have a look at the https://docs.moodle.org/en/Multi-language_content_filter.

For further details, there is a dedicated forum Languages https://moodle.org/mod/forum/view.php?id=43 with initial info in the header.