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/commit_warnings.js

@@ -27,7 +27,7 @@ export function uiCommitWarnings(context) {
 
             containerEnter
                 .append('h3')
-                .text(severity === 'warning' ? t('commit.warnings') : t('commit.errors'));
+                .html(severity === 'warning' ? t('commit.warnings') : t('commit.errors'));
 
             containerEnter
                 .append('ul')
@@ -64,7 +64,7 @@ export function uiCommitWarnings(context) {
                 .merge(items);
 
             items.selectAll('.issue-message')
-                .text(function(d) {
+                .html(function(d) {
                     return d.message(context);
                 });