don't use add/delete icons on buttons, use '+' and '-' for consistency with rest of UI
don't use add/delete icons on buttons, use '+' and '-' for consistency with rest of UI

fbennett/csl-editor,citation-style-editor/csl-editor,citation-style-language/csl-editor,adam3smith/csl-editor,citation-style-language/csl-editor,adam3smith/csl-editor,fbennett/csl-editor,citation-style-editor/csl-editor,citation-style-language/csl-editor,citation-style-editor/csl-editor,adam3smith/csl-editor