After trying to translate the "social network" module to my language, I realized that there were some terms that kept unchanged. And the common thing between these terms is the translation type "code". For example, the term "Compose a new message":

#. module: mail
#. openerp-web
#: code:addons/mail/static/src/xml/mail.xml:188
#, python-format
msgid "Compose a new message"
msgstr "Soạn thư mới"

Then I went through Settings -> Translations -> Application terms -> Translated terms, searched for "Compose a new message" and changed its translation type to "view", then the term has been translated and displayed on view. What are the differences between the translation types? And could it affect the system if I changed all "code"-typed terms into "view" for translation purpose?