diff --git a/README.md b/README.md
index 7a144cad..9558d234 100644
--- a/README.md
+++ b/README.md
@@ -4,12 +4,16 @@ to read converted documents in HTML format, get support in our forum:
 
 # How to translate and contribute
 
-* Create a new directory and name it to the short language code. e.g. for
-  Germany, please name it `zh_CN`.
-* Add file `zh_CN/_lang.md` with the full name of the language. e.g.
-  write `English` in `en_US/_lang.md`, `简体中文` in `zh_CN/_lang.md`.
+* Create a new directory and name it to the short language code. for example:
+    * `de_DE` for `German`
+    * `zh_CN` for `Chinese`
+* Add file `[xx_XX]/_lang.md` with the full name of the language. for example:
+    * `English` in `en_US/_lang.md`
+    * `Deutsch` in `de_DE/_lang.md`
+    * `简体中文` in `zh_CN/_lang.md`.
 * Copy the markdown document you want to translate to new language directory,
-  create the same sub-directories as original document. For example, to
-  translate `en_US/howto/reset.user.password.md`, please create
-  `zh_CN/howto/` and copy `reset.user.password.md` to `zh_CN/howto/`.
+  create the same sub-directory as original document. For example, to
+  translate `en_US/howto/reset.user.password.md` to Chinese, please create
+  directory `zh_CN/howto/` and copy `reset.user.password.md` to `zh_CN/howto/`
+  (with same file name).
 * Translate the file and send a pull request.
diff --git a/en_US/faq/2-iredadmin-pro.restful.api.md b/en_US/faq/2-iredadmin-pro.restful.api.md
index f106597b..7a77f9be 100644
--- a/en_US/faq/2-iredadmin-pro.restful.api.md
+++ b/en_US/faq/2-iredadmin-pro.restful.api.md
@@ -121,7 +121,7 @@ Parameter Name | Summary | Sample Usage
 `cn` | display name | `cn=My List Name`
 `accessPolicy` | Defines who can send email to this mail alias account | `accessPolicy=public`
 
-> Note: `accessPolicy` for mail alias account is available for only SQL backends.
+> Note: `accessPolicy` for mail alias account is only available for SQL backends.
 
 ### Throttling
 
diff --git a/en_US/integrations/active.directory.md b/en_US/integrations/active.directory.md
index 97245d1d..1b6b10bf 100644
--- a/en_US/integrations/active.directory.md
+++ b/en_US/integrations/active.directory.md
@@ -91,24 +91,24 @@ If it prints all users stored in AD server, then it's working as expected.
 Disable unused iRedMail special settings:
 
 ```shell
-# postconf -e virtual_alias_maps=''
-# postconf -e sender_bcc_maps=''
-# postconf -e recipient_bcc_maps=''
-# postconf -e relay_domains=''
-# postconf -e relay_recipient_maps=''
+postconf -e virtual_alias_maps=''
+postconf -e sender_bcc_maps=''
+postconf -e recipient_bcc_maps=''
+postconf -e relay_domains=''
+postconf -e relay_recipient_maps=''
 ```
 
 Add your mail domain name in `smtpd_sasl_local_domain` and `virtual_mailbox_domains`:
 
 ```shell
-# postconf -e smtpd_sasl_local_domain='example.com'
-# postconf -e virtual_mailbox_domains='example.com'
+postconf -e smtpd_sasl_local_domain='example.com'
+postconf -e virtual_mailbox_domains='example.com'
 ```
 
 Change transport maps setting:
 
 ```
-# postconf -e transport_maps='hash:/etc/postfix/transport'
+postconf -e transport_maps='hash:/etc/postfix/transport'
 ```
 
 Enable AD query. __Note__: We will create these 3 files later.
@@ -116,19 +116,19 @@ Enable AD query. __Note__: We will create these 3 files later.
 * Verify SMTP senders
 
 ```shell
-# postconf -e smtpd_sender_login_maps='proxy:ldap:/etc/postfix/ad_sender_login_maps.cf'
+postconf -e smtpd_sender_login_maps='proxy:ldap:/etc/postfix/ad_sender_login_maps.cf'
 ```
 
 * Verify local mail users
 
 ```shell
-# postconf -e virtual_mailbox_maps='proxy:ldap:/etc/postfix/ad_virtual_mailbox_maps.cf'
+postconf -e virtual_mailbox_maps='proxy:ldap:/etc/postfix/ad_virtual_mailbox_maps.cf'
 ```
 
 * Verify local mail lists/groups.
 
 ```
-# postconf -e virtual_alias_maps='proxy:ldap:/etc/postfix/ad_virtual_group_maps.cf'
+postconf -e virtual_alias_maps='proxy:ldap:/etc/postfix/ad_virtual_group_maps.cf'
 ```
 
 * Create/edit file: `/etc/postfix/transport`.
diff --git a/en_US/upgrade/0-upgrade.sogo.2.to.3.md b/en_US/upgrade/0-upgrade.sogo.2.to.3.md
index af0f8b4f..89434c8f 100644
--- a/en_US/upgrade/0-upgrade.sogo.2.to.3.md
+++ b/en_US/upgrade/0-upgrade.sogo.2.to.3.md
@@ -15,7 +15,7 @@ below.
 * Backup config files first:
 
 ```
-mkdir /root/sogo-backup/{sogo,sysconfig}
+mkdir -p /root/sogo-backup/{sogo,sysconfig}
 cp /etc/sogo/* /root/sogo-backup/sogo/
 cp /etc/sysconfig/sogo /root/sogo-backup/sysconfig/
 ```
@@ -51,7 +51,7 @@ service sogod restart
 * Backup config files first:
 
 ```
-mkdir /root/sogo-backup/{sogo,default}
+mkdir -p /root/sogo-backup/{sogo,default}
 cp /etc/sogo/* /root/sogo-backup/sogo/
 cp /etc/default/sogo /root/sogo-backup/default/
 ```
diff --git a/html/active.directory.html b/html/active.directory.html
index 6db4541c..8bbc6ba0 100644
--- a/html/active.directory.html
+++ b/html/active.directory.html
@@ -120,39 +120,39 @@ Enter password: password_of_vmail
 <p>If it prints all users stored in AD server, then it's working as expected.</p>
 <h3 id="enable-ldap-query-with-ad-in-postfix">Enable LDAP query with AD in Postfix</h3>
 <p>Disable unused iRedMail special settings:</p>
-<pre><code class="shell"># postconf -e virtual_alias_maps=''
-# postconf -e sender_bcc_maps=''
-# postconf -e recipient_bcc_maps=''
-# postconf -e relay_domains=''
-# postconf -e relay_recipient_maps=''
+<pre><code class="shell">postconf -e virtual_alias_maps=''
+postconf -e sender_bcc_maps=''
+postconf -e recipient_bcc_maps=''
+postconf -e relay_domains=''
+postconf -e relay_recipient_maps=''
 </code></pre>
 
 <p>Add your mail domain name in <code>smtpd_sasl_local_domain</code> and <code>virtual_mailbox_domains</code>:</p>
-<pre><code class="shell"># postconf -e smtpd_sasl_local_domain='example.com'
-# postconf -e virtual_mailbox_domains='example.com'
+<pre><code class="shell">postconf -e smtpd_sasl_local_domain='example.com'
+postconf -e virtual_mailbox_domains='example.com'
 </code></pre>
 
 <p>Change transport maps setting:</p>
-<pre><code># postconf -e transport_maps='hash:/etc/postfix/transport'
+<pre><code>postconf -e transport_maps='hash:/etc/postfix/transport'
 </code></pre>
 
 <p>Enable AD query. <strong>Note</strong>: We will create these 3 files later.</p>
 <ul>
 <li>Verify SMTP senders</li>
 </ul>
-<pre><code class="shell"># postconf -e smtpd_sender_login_maps='proxy:ldap:/etc/postfix/ad_sender_login_maps.cf'
+<pre><code class="shell">postconf -e smtpd_sender_login_maps='proxy:ldap:/etc/postfix/ad_sender_login_maps.cf'
 </code></pre>
 
 <ul>
 <li>Verify local mail users</li>
 </ul>
-<pre><code class="shell"># postconf -e virtual_mailbox_maps='proxy:ldap:/etc/postfix/ad_virtual_mailbox_maps.cf'
+<pre><code class="shell">postconf -e virtual_mailbox_maps='proxy:ldap:/etc/postfix/ad_virtual_mailbox_maps.cf'
 </code></pre>
 
 <ul>
 <li>Verify local mail lists/groups.</li>
 </ul>
-<pre><code># postconf -e virtual_alias_maps='proxy:ldap:/etc/postfix/ad_virtual_group_maps.cf'
+<pre><code>postconf -e virtual_alias_maps='proxy:ldap:/etc/postfix/ad_virtual_group_maps.cf'
 </code></pre>
 
 <ul>
diff --git a/html/upgrade.sogo.2.to.3.html b/html/upgrade.sogo.2.to.3.html
index 94a0a36f..6d61b055 100644
--- a/html/upgrade.sogo.2.to.3.html
+++ b/html/upgrade.sogo.2.to.3.html
@@ -34,7 +34,7 @@ below.</p>
 <ul>
 <li>Backup config files first:</li>
 </ul>
-<pre><code>mkdir /root/sogo-backup/{sogo,sysconfig}
+<pre><code>mkdir -p /root/sogo-backup/{sogo,sysconfig}
 cp /etc/sogo/* /root/sogo-backup/sogo/
 cp /etc/sysconfig/sogo /root/sogo-backup/sysconfig/
 </code></pre>
@@ -69,7 +69,7 @@ cp /root/sogo-backup/sysconfig/sogo /etc/sysconfig/
 <ul>
 <li>Backup config files first:</li>
 </ul>
-<pre><code>mkdir /root/sogo-backup/{sogo,default}
+<pre><code>mkdir -p /root/sogo-backup/{sogo,default}
 cp /etc/sogo/* /root/sogo-backup/sogo/
 cp /etc/default/sogo /root/sogo-backup/default/
 </code></pre>