statis/js/people.js: Add function `get_user_type`.

Add function `get_user_type`, which returns user
type-"Administrator", "Guest", "Bot" or "Member"
depending on what they are.

frontend_tests/node_tests/people.js

@@ -8,12 +8,16 @@ set_global('page_params', {});
 set_global('md5', function (s) {
     return 'md5-' + s;
 });
+set_global('i18n', global.stub_i18n);
 
 var me = {
     email: 'me@example.com',
     user_id: 30,
     full_name: 'Me Myself',
     timezone: 'US/Pacific',
+    is_admin: false,
+    is_guest: false,
+    is_bot: false,
 };
 
 var isaac = {
@@ -165,6 +169,38 @@ run_test('user_timezone', () => {
     assert.equal(people.get_user_time(me.user_id), '12:09 AM');
 });
 
+run_test('user_type', () => {
+    var realm_admin = {
+        email: 'realm_admin@example.com',
+        user_id: 32,
+        is_admin: true,
+        is_guest: false,
+        is_bot: false,
+    };
+    var guest = {
+        email: 'guest@example.com',
+        user_id: 33,
+        is_admin: false,
+        is_guest: true,
+        is_bot: false,
+    };
+    var bot = {
+        email: 'bot@example.com',
+        user_id: 34,
+        is_admin: false,
+        is_guest: false,
+        is_bot: true,
+    };
+
+    people.add(realm_admin);
+    people.add(guest);
+    people.add(bot);
+    assert.equal(people.get_user_type(me.user_id), i18n.t('Member'));
+    assert.equal(people.get_user_type(realm_admin.user_id), i18n.t('Administrator'));
+    assert.equal(people.get_user_type(guest.user_id), i18n.t('Guest'));
+    assert.equal(people.get_user_type(bot.user_id), i18n.t('Bot'));
+});
+
 run_test('updates', () => {
     var person = people.get_by_email('me@example.com');
     people.set_full_name(person, 'Me the Third');

static/js/people.js

@@ -223,6 +223,19 @@ exports.get_user_time = function (user_id) {
     }
 };
 
+exports.get_user_type = function (user_id) {
+    var user_profile = exports.get_person_from_user_id(user_id);
+
+    if (user_profile.is_admin) {
+        return i18n.t("Administrator");
+    } else if (user_profile.is_guest) {
+        return i18n.t("Guest");
+    } else if (user_profile.is_bot) {
+        return i18n.t("Bot");
+    }
+    return i18n.t("Member");
+};
+
 exports.emails_strings_to_user_ids_string = function (emails_string) {
     var emails = emails_string.split(',');
     return exports.email_list_to_user_ids_string(emails);