spelling: Correctly write "cannot".

None of these errors were user-facing; mainly in comments, plus
one bit of internal docs and a developer tool.

docs/translating/chinese.md

@@ -72,7 +72,7 @@ group. However, "讨论组" has one more Chinese character than "频道
 * Invite-Only/Public Stream - **私有/公开频道**
 
 "Invite-Only Stream" requires users must be invited explicitly to
-subscribe, which assures a high privacy. Other users can not perceive
+subscribe, which assures a high privacy. Other users cannot perceive
 the presence of such streams. Since literal translation is hard to
 read, it is translated sense to sense as "私有频道(Private Stream)"。
 

scripts/lib/third/install-yarn.sh

@@ -57,7 +57,7 @@ yarn_get_tarball() {
 yarn_verify_integrity() {
   # Check if GPG is installed
   if [[ -z "$(command -v gpg)" ]]; then
-    printf "$yellow> WARNING: GPG is not installed, integrity can not be verified!$reset\n"
+    printf "$yellow> WARNING: GPG is not installed, integrity cannot be verified!$reset\n"
     return
   fi
 
@@ -71,7 +71,7 @@ yarn_verify_integrity() {
   gpg --list-keys $gpg_key >/dev/null 2>&1 || (curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | gpg --import)
 
   if [ ! -f "$1.asc" ]; then
-    printf "$red> Could not download GPG signature for this Yarn release. This means the release can not be verified!$reset\n"
+    printf "$red> Could not download GPG signature for this Yarn release. This means the release cannot be verified!$reset\n"
     yarn_verify_or_quit "> Do you really want to continue?"
     return
   fi

static/js/stream_data.js

@@ -364,7 +364,7 @@ exports.remove_subscriber = function (stream_name, user_id) {
 exports.user_is_subscribed = function (stream_name, user_email) {
     var sub = exports.get_sub(stream_name);
     if (typeof sub === 'undefined' || !sub.can_access_subscribers) {
-        // If we don't know about the stream, or we ourselves can not access subscriber list,
+        // If we don't know about the stream, or we ourselves cannot access subscriber list,
         // so we return undefined (treated as falsy if not explicitly handled).
         blueslip.warn("We got a user_is_subscribed call for a non-existent or inaccessible stream.");
         return;

static/js/subs.js

@@ -255,8 +255,8 @@ exports.update_settings_for_unsubscribed = function (sub) {
     if (active_stream !== undefined && active_stream.id === sub.stream_id) {
         stream_edit.rerender_subscribers_list(sub);
 
-        // If user unsubscribed from private stream then user can not subscribe to
+        // If user unsubscribed from private stream then user cannot subscribe to
-        // stream without invitation and can not add subscribers to stream.
+        // stream without invitation and cannot add subscribers to stream.
         if (!sub.should_display_subscription_button) {
             settings_button.hide();
             $('.add_subscribers_container').hide();

zerver/tests/test_bots.py

@@ -477,7 +477,7 @@ class BotTest(ZulipTestCase, UploadSerializeMixin):
         # Hamlet's bot.
         self.login(self.example_email('othello'))
 
-        # Can not deactivate a user as a bot
+        # Cannot deactivate a user as a bot
         result = self.client_delete("/json/bots/" + self.example_email("hamlet"))
         self.assert_json_error(result, 'No such bot')
 
@@ -488,7 +488,7 @@ class BotTest(ZulipTestCase, UploadSerializeMixin):
         self.login(self.example_email('hamlet'))
         self.assert_num_bots_equal(1)
 
-        # Can not deactivate a bot as a user
+        # Cannot deactivate a bot as a user
         result = self.client_delete("/json/users/hambot-bot@zulip.testserver")
         self.assert_json_error(result, 'No such user')
         self.assert_num_bots_equal(1)

zerver/tests/test_messages.py

@@ -311,7 +311,7 @@ class TestCrossRealmPMs(ZulipTestCase):
         with assert_invalid_email():
             self.send_huddle_message(feedback_email, [user1_email, user2_email])
 
-        # Users on the different realms can not PM each other
+        # Users on the different realms cannot PM each other
         with assert_invalid_email():
             self.send_personal_message(user1_email, user2_email, sender_realm="1.example.com")
 
@@ -319,7 +319,7 @@ class TestCrossRealmPMs(ZulipTestCase):
         with assert_invalid_email():
             self.send_personal_message(user1_email, "hamlet@zulip.com", sender_realm="1.example.com")
 
-        # Users on three different realms can not PM each other
+        # Users on three different realms cannot PM each other
         with assert_invalid_email():
             self.send_huddle_message(user1_email, [user2_email, user3_email],
                                      sender_realm="1.example.com")

zerver/tests/test_subs.py

@@ -442,7 +442,7 @@ class StreamAdminTest(ZulipTestCase):
                                    {'new_description': ujson.dumps('new description')})
         self.assert_json_success(result)
 
-        # But can not change stream type.
+        # But cannot change stream type.
         result = self.client_patch('/json/streams/%d' % (stream_id,),
                                    {'stream_name': ujson.dumps('private_stream'),
                                     'is_private': ujson.dumps(True)})

zerver/tests/test_users.py

@@ -354,11 +354,11 @@ class ActivateTest(ZulipTestCase):
         do_change_is_admin(admin, True)
         self.login(self.example_email("othello"))
 
-        # Can not deactivate a user with the bot api
+        # Cannot deactivate a user with the bot api
         result = self.client_delete('/json/bots/hamlet@zulip.com')
         self.assert_json_error(result, 'No such bot')
 
-        # Can not deactivate a nonexistent user.
+        # Cannot deactivate a nonexistent user.
         result = self.client_delete('/json/users/nonexistent@zulip.com')
         self.assert_json_error(result, 'No such user')
 
@@ -368,7 +368,7 @@ class ActivateTest(ZulipTestCase):
         result = self.client_delete('/json/users/othello@zulip.com')
         self.assert_json_error(result, 'Cannot deactivate the only organization administrator')
 
-        # Can not reactivate a nonexistent user.
+        # Cannot reactivate a nonexistent user.
         result = self.client_post('/json/users/nonexistent@zulip.com/reactivate')
         self.assert_json_error(result, 'No such user')
 
@@ -377,11 +377,11 @@ class ActivateTest(ZulipTestCase):
         do_change_is_admin(non_admin, False)
         self.login(self.example_email("othello"))
 
-        # Can not deactivate a user with the users api
+        # Cannot deactivate a user with the users api
         result = self.client_delete('/json/users/hamlet@zulip.com')
         self.assert_json_error(result, 'Insufficient permission')
 
-        # Can not reactivate a user
+        # Cannot reactivate a user
         result = self.client_post('/json/users/hamlet@zulip.com/reactivate')
         self.assert_json_error(result, 'Insufficient permission')