Twitter supports saving a specific search. However, it just seems to be the basic string search as opposed their advanced search on search.twitter.com. The advanced search allows you to select a language you would like the results in. How do I get the advanced search to be saved?
You can simply add
lang:en to the search query. e.g.
Bookmark the avanced search page in your browser. Press Ctrl+D for bookmark.
So that you can directly use this bookmark for search results.
You can use the following operators in a saved search;
But language doesn't appear to be among them, it also appears not to be listed in the 'New Twitter' advanced search page;