Merge branch 'patch-1' into 'master'

Adding notes about certificate installation

See merge request !104

docs.it4i/general/obtaining-login-credentials/obtaining-login-credentials.md

@@ -118,6 +118,9 @@ Certificate generation process for academic purposes, utilizing the CESNET certi
 
 * [How to generate a personal TCS certificate in Mozilla Firefox web browser (in Czech)](http://idoc.vsb.cz/xwiki/wiki/infra/view/uzivatel/moz-cert-gen)
 
+!!! note
+    Certificate file can be installed into your email client. Web-based email interfaces cannot be used for secure communication, external application, such as Thunderbird or Outlook must be used. This way, your new credentials will be visible only in applications, that have access to your certificate.
+
 If you are not able to obtain certificate from any of the respected certification authorities, please follow the Alternative Way bellow.
 
 A FAQ about certificates can be found here: [Certificates FAQ](certificates-faq/).
@@ -142,7 +145,7 @@ Follow these steps **only** if you can not obtain your certificate in a standard
 * You will be prompted to choose a passphrase for your new certificate. This passphrase will be needed for installation into your favourite email client.
 
 !!! note
-    Certificate file now can be installed into your email client. Web-based email interfaces cannot be used for secure communication, externall application, such as Thunderbird or Outlook must be used (instructions bellow). This way, your new credentials will be visible only in applications, that have access to your certificate.
+    Certificate file now can be installed into your email client. Web-based email interfaces cannot be used for secure communication, external application, such as Thunderbird or Outlook must be used (instructions bellow). This way, your new credentials will be visible only in applications, that have access to your certificate.
 
 ## Installation of the Certificate Into Your Mail Client