fix placeholders

src/assets/i18n/en.json

@@ -147,7 +147,7 @@
   "create_data_offer_page.conditions_for_use_description_hint": "Additional not legally relevant usage instructions (e.g. how to cite the dataset). The field supports",
   "create_data_offer_page.conditions_for_use_label": "Conditions for use",
   "create_data_offer_page.conditions_for_use_placeholder": "Please cite the dataset as...",
-  "create_data_offer_page.contact_email_placeholder": "[email protected]",
+  "create_data_offer_page.contact_email_placeholder": "Contact E-Mail",
   "create_data_offer_page.contact_email_tooltip": "This email address will be offered to potential consumers for contacting you. This is done in place of having an actual data source connected.",
   "create_data_offer_page.contact_email": "Contact E-Mail",
   "create_data_offer_page.content_type": "Content Type",
@@ -173,7 +173,7 @@
   "create_data_offer_page.description_uses": "The description uses",
   "create_data_offer_page.description": "Description",
   "create_data_offer_page.documentation": "Documentation",
-  "create_data_offer_page.email_subject_placeholder": "Data Offer 'xyz'",
+  "create_data_offer_page.email_subject_placeholder": "Preferred E-Mail Subject",
   "create_data_offer_page.email_subject_tooltip": "When potential customers reach out to you via email, you’ll receive messages with this subject line.",
   "create_data_offer_page.email_subject": "Preferred E-Mail Subject",
   "create_data_offer_page.end_date_inclusive": "End date (inclusive)",