If you are using a mobile device or a browser not supported by the Zotero software, you can use the Zotero Bookmarklet to save items to your Zotero library on the Zotero servers. Once you have registered for a free Zotero account, follow the instructions for installing the Bookmarklet.
When you open up the Zotero application on your computer and sync your library with Zotero's servers, the items will be added to "My Library." You can then add them to your collections.
Switching languages
Zotero's interface language defaults to matching the operating system's language. You can change the language to one of the options provided in the drop-down menu under Edit > Preferences > Advanced > General
To keep Zotero's user interface in one language, but to use another language for the citations and bibliographies created by Zotero, select the citation language you would like to use from either:
JURIS-M is an unofficial version of Zotero that allows you to store transliterations and translations of names, titles, and other fields, and create citations and bibliographies that show this information.
In the word processing program Zotero does create the footnote (or endnote), but it does so by passing a "create footnote" command on to your word processor. Any issues relating to the format of the footnote or what numbering style to use needs to be set in your word processor.
On the Zotero site you can find a list of additional plugins for Zotero created by Zotero users.