https://github.com/tracim/tracim/issues/720, changing the placeholder according to apps via the translation function

frontend_app_html-document/i18next.scanner/en/translation.json

 {
   "Last version": "Last version",
-  "Validate and create": "Validate and create"
+  "Validate and create": "Validate and create",
+  "Document's title": "Document's title"
 }

frontend_app_html-document/i18next.scanner/fr/translation.json

 {
   "Last version": "Dernière version",
-  "Validate and create": "Valider et créer"
+  "Validate and create": "Valider et créer",
+  "Document's title": "Titre du document"
 }

frontend_app_html-document/src/container/PopupCreateHtmlDocument.jsx

         contentName={this.state.newContentName}
         onChangeContentName={this.handleChangeNewContentName}
         btnValidateLabel={this.props.t('Validate and create')}
+        inputPlaceholder={this.props.t("Document's title")}
       />
     )
   }

frontend_app_thread/i18next.scanner/en/translation.json

 {
-  "Validate and create": "Validate and create"
+  "Validate and create": "Validate and create",
+  "Topic's subject": "Topic's subject"
 }

frontend_app_thread/i18next.scanner/fr/translation.json

 {
-  "Validate and create": "Valider et créer"
+  "Validate and create": "Valider et créer",
+  "Topic's subject": "Sujet de la discussion"
 }

frontend_app_thread/src/container/PopupCreateThread.jsx

         contentName={this.state.newContentName}
         onChangeContentName={this.handleChangeNewContentName}
         btnValidateLabel={this.props.t('Validate and create')}
+        inputPlaceholder={this.props.t("Topic's subject")}
       />
     )
   }

frontend_lib/src/component/CardPopup/CardPopupCreateContent.jsx

           <input
             type='text'
             className='createcontent__form__input'
-            placeHolder='Nommez votre contenu...'
+            placeHolder={props.inputPlaceholder}
             value={props.contentName}
             onChange={props.onChangeContentName}
           />
   label: PropTypes.string,
   customColor: PropTypes.string,
   faIcon: PropTypes.string,
-  btnValidateLabel: PropTypes.string
+  btnValidateLabel: PropTypes.string,
+  inputPlaceholder: PropTypes.string
 }
 
 PopupCreateContent.defaultProps = {