Make t function return a span element with a lang attribute unless html: false is specified in the options (re: #7963)

Update `text` functions to `html` to support inserting the `span` elements
Specify `html: false` for various instances where a `span` is not desired, e.g. `placeholder` and `title` attributes

modules/ui/loading.js

@@ -23,7 +23,7 @@ export function uiLoading(context) {
 
     loadertext
       .append('h3')
-      .text(_message);
+      .html(_message);
 
     _modalSelection.select('button.close')
       .attr('class', 'hide');