diff --git a/public/src/modules/search.js b/public/src/modules/search.js
index 957032c47f..81b98e9ab3 100644
--- a/public/src/modules/search.js
+++ b/public/src/modules/search.js
@@ -11,7 +11,7 @@ define('search', ['navigator', 'translator'], function(nav, translator) {
 		var term = data.term;
 
 		// Detect if a tid was specified
-		var topicSearch = term.match(/in:topic-([\d]+)/);
+		var topicSearch = term.match(/^in:topic-([\d]+) /);
 
 		if (!topicSearch) {
 			term = term.replace(/^[ ?#]*/, '');
@@ -28,7 +28,9 @@ define('search', ['navigator', 'translator'], function(nav, translator) {
 			var cleanedTerm = term.replace(topicSearch[0], ''),
 				tid = topicSearch[1];
 
-			Search.queryTopic(tid, cleanedTerm, callback);
+			if (cleanedTerm.length > 0) {
+				Search.queryTopic(tid, cleanedTerm, callback);
+			}
 		}
 	};
 
diff --git a/public/src/modules/translator.js b/public/src/modules/translator.js
index 4569fb0d5b..42efe5c529 100644
--- a/public/src/modules/translator.js
+++ b/public/src/modules/translator.js
@@ -125,7 +125,7 @@
 		if (typeof language === 'function') {
 			callback = language;
 			if ('undefined' !== typeof window && config) {
-				language = config.userLang || 'en_GB';
+				language = utils.params().lang || config.userLang || 'en_GB';
 			} else {
 				var meta = require('../../../src/meta');
 				language = meta.config.defaultLang || 'en_GB';
diff --git a/src/categories.js b/src/categories.js
index ac89bb4ac1..e033102264 100644
--- a/src/categories.js
+++ b/src/categories.js
@@ -156,7 +156,7 @@ var async = require('async'),
 		}
 
 		category.name = validator.escape(category.name);
-		category.disabled = parseInt(category.disabled, 10) === 1;
+		category.disabled = category.hasOwnProperty('disabled') ? parseInt(category.disabled, 10) === 1 : undefined;
 		category.icon = category.icon || 'hidden';
 		if (category.hasOwnProperty('post_count')) {
 			category.post_count = category.totalPostCount = category.post_count || 0;
diff --git a/src/controllers/api.js b/src/controllers/api.js
index 5518addd45..c09a96490d 100644
--- a/src/controllers/api.js
+++ b/src/controllers/api.js
@@ -64,7 +64,7 @@ apiController.getConfig = function(req, res, next) {
 	config.maximumFileSize = meta.config.maximumFileSize;
 	config['theme:id'] = meta.config['theme:id'];
 	config.defaultLang = meta.config.defaultLang || 'en_GB';
-	config.userLang = config.defaultLang;
+	config.userLang = req.query.lang || config.defaultLang;
 	config.environment = process.env.NODE_ENV;
 	config.loggedIn = !!req.user;
 	config['cache-buster'] = meta.config['cache-buster'] || '';
@@ -89,7 +89,7 @@ apiController.getConfig = function(req, res, next) {
 		config.topicsPerPage = settings.topicsPerPage;
 		config.postsPerPage = settings.postsPerPage;
 		config.notificationSounds = settings.notificationSounds;
-		config.userLang = settings.userLang || config.defaultLang;
+		config.userLang = req.query.lang || settings.userLang || config.defaultLang;
 		config.openOutgoingLinksInNewTab = settings.openOutgoingLinksInNewTab;
 		config.topicPostSort = settings.topicPostSort || config.topicPostSort;
 		config.categoryTopicSort = settings.categoryTopicSort || config.categoryTopicSort;
diff --git a/src/controllers/unread.js b/src/controllers/unread.js
index 0354ea7310..672ec37542 100644
--- a/src/controllers/unread.js
+++ b/src/controllers/unread.js
@@ -30,11 +30,11 @@ unreadController.unread = function(req, res, next) {
 		},
 		function(_results, next) {
 			results = _results;
-			categories.getMultipleCategoryFields(results.watchedCategories, ['cid', 'name', 'slug', 'icon', 'link'], next);
+			categories.getMultipleCategoryFields(results.watchedCategories, ['cid', 'name', 'slug', 'icon', 'link', 'disabled'], next);
 		},
 		function(categories, next) {
 			categories = categories.filter(function(category) {
-				return category && !category.link;
+				return category && !category.link && !category.disabled;
 			});
 			categories.forEach(function(category) {
 				category.selected = parseInt(category.cid, 10) === parseInt(cid, 10);
diff --git a/src/middleware/middleware.js b/src/middleware/middleware.js
index 0c4cca5e3e..77951daf74 100644
--- a/src/middleware/middleware.js
+++ b/src/middleware/middleware.js
@@ -168,6 +168,7 @@ middleware.isAdmin = function(req, res, next) {
 
 middleware.buildHeader = function(req, res, next) {
 	res.locals.renderHeader = true;
+	res.locals.isAPI = false;
 
 	middleware.applyCSRF(req, res, function() {
 		async.parallel({
@@ -347,6 +348,7 @@ middleware.processRender = function(req, res, next) {
 					}
 					str = template + str;
 					var language = res.locals.config ? res.locals.config.userLang || 'en_GB' : 'en_GB';
+					language = req.query.lang || language;
 					translator.translate(str, language, function(translated) {
 						fn(err, translated);
 					});
diff --git a/src/posts/summary.js b/src/posts/summary.js
index b41519473a..582354499d 100644
--- a/src/posts/summary.js
+++ b/src/posts/summary.js
@@ -72,6 +72,11 @@ module.exports = function(Posts) {
 				});
 
 				async.map(posts, function(post, next) {
+					// If the post author isn't represented in the retrieved users' data, then it means they were deleted, assume guest.
+					if (!results.users.hasOwnProperty(post.uid)) {
+						post.uid = 0;
+					}
+
 					post.user = results.users[post.uid];
 					post.topic = results.topics[post.tid];
 					post.category = results.categories[post.topic.cid];
diff --git a/src/topics/teaser.js b/src/topics/teaser.js
index 4558fb251a..29e05703d2 100644
--- a/src/topics/teaser.js
+++ b/src/topics/teaser.js
@@ -57,6 +57,11 @@ module.exports = function(Topics) {
 				var tidToPost = {};
 
 				async.each(postData, function(post, next) {
+					// If the post author isn't represented in the retrieved users' data, then it means they were deleted, assume guest.
+					if (!users.hasOwnProperty(post.uid)) {
+						post.uid = 0;
+					}
+
 					post.user = users[post.uid];
 					post.timestamp = utils.toISOString(post.timestamp);
 					tidToPost[post.tid] = post;