Turn on all of Microsoft's recommend lint rules

Biggest changes forced by this: alt tags for all images, resulting in
new strings added to messages.json, and a new i18n paramter/prop added
in a plot of places.

Another change of note is that there are two new tslint.json files under
ts/test and ts/styleguide to relax our rules a bit there. This required
a change to our package.json script, as manually specifying the config
file there made it ignore our tslint.json files in subdirectories

ts/backbone/views/Lightbox.ts

@@ -5,6 +5,7 @@ export const show = (element: HTMLElement): void => {
   if (container === null) {
     throw new TypeError("'.lightbox-container' is required");
   }
+  // tslint:disable-next-line:no-inner-html
   container.innerHTML = '';
   container.style.display = 'block';
   container.appendChild(element);
@@ -17,6 +18,7 @@ export const hide = (): void => {
   if (container === null) {
     return;
   }
+  // tslint:disable-next-line:no-inner-html
   container.innerHTML = '';
   container.style.display = 'none';
 };