(1) Language (2) Adding styles

Having previously re-installed Zotero (following helpful advice by ADAM SMITH in a previous discussion) I am now experiencing 2 new problems:
1) Zotero is now communicating with me "Danish" which I understand (I am in Denmark), but I would much rather revert to the English version. HOW CAN I DO THIS?
2) My list of available styles is now extremely short, and I have no visible "+" button (in Styles under Preferences) which will let me add a new one. WHAT'S WRONG? As an alternative, I managed to locate the complete Zotero list of styles, found what I want to add (Harvard Blue Book), and then saved that to my Zotero directory folder, but this style is still not on my list.
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