Create initial language support

Create support for languages, then reformat user, home, and post pages
to use it, and create en and en-us language files.

src/site/html/static/js/elemjs/elemjs.js

@@ -57,7 +57,7 @@ class ElemJS {
 	event(name, callback) {
 		this.element.addEventListener(name, event => callback(event))
 	}
-	child(toAdd, position) {
+	child(toAdd, position = undefined) {
 		if (typeof(toAdd) == "object") {
 			toAdd.parent = this;
 			if (typeof(position) == "number" && position >= 0) {

src/site/html/static/js/pagination.js

@@ -75,7 +75,7 @@ class NextPage extends FreezeWidth {
 	fetch() {
 		if (this.fetching) return
 		this.fetching = true
-		this.freeze("Loading...")
+		this.freeze(this.element.getAttribute("data-loading-text"))
 		const type = this.element.getAttribute("data-type")
 
 		return fetch(`/fragment/user/${this.element.getAttribute("data-username")}/${this.nextPageNumber}?type=${type}`).then(res => res.text()).then(text => {