OO-1575 Add ellipsis in segments when text too long

src/main/webapp/static/themes/light/modules/_various_modules.scss

@@ -418,6 +418,11 @@ ul.o_certificates li {
 }
 
 /* Segmented view wrapper */
+.o_segments.btn-group a span {
+	overflow: hidden;
+    display: block;
+    text-overflow: ellipsis;
+}
 .o_segments_content {
 	margin-top: $line-height-computed;
 }