https://github.com/tracim/tracim/issues/737, change Document's name to title

frontend/i18next.scanner/en/translation.json

   "Create your own collaborative workspaces on trac.im": "Create your own collaborative workspaces on trac.im",
   "Copyright 2013 - 2017": "Copyright 2013 - 2017",
   "Disconnection error": "Disconnection error",
-  "Create new workspace": "Create new workspace",
   "Error": "Error",
   "Email or password invalid": "Email or password invalid",
   "Type": "Type",
-  "Document's name": "Document's name",
   "Status": "Status",
   "Create in folder...": "Create in folder...",
-  "Search...": "Search..."
+  "Search...": "Search...",
+  "Create a workspace": "Create a workspace",
+  "Title": "Title"
 }

frontend/i18next.scanner/fr/translation.json

   "Error": "Erreur",
   "Email or password invalid": "Email ou mot de passe invalid",
   "Type": "Type",
-  "Document's name": "Nom du document",
   "Status": "Statut",
   "Create in folder...": "Créer dans le dossier ...",
   "Search...": "Rechercher ...",
-  "Create a workspace": "Créer un espace de travail"
+  "Create a workspace": "Créer un espace de travail",
+  "Title": "Titre"
 }

frontend/src/component/Workspace/ContentItemHeader.jsx

         {props.t('Type')}
       </div>
       <div className='content__header__name'>
-        {props.t("Document's name")}
+        {props.t("Title")}
       </div>
       <div className='content__header__status'>
         {props.t('Status')}