text: """Constants module."""
  
  from __future__ import unicode_literals
  
  # Email settings.
  SMTP = "mail.mycompany.com:25"
  SENDER = "no-reply@mycompany.com"
  
  # Email templates.
  ERROR_REPORT = """<html>
      <body>
          <font face='verdana'>
              <b>Error Report.</b><br /><br />
              <b>Error Message</b><br />
              <p>{}</p><br /><br />
              <b>Error Details</b>
              <p>{}</p><br /><br />
              <b>System Details</b><br /><br />
              *** Please do not reply to this email address.
          </font>
      </body>
  </html>"""
  
  # Language settings.
  DEFAULT_LANGUAGE = "en_US"
  
  # Button's text property.
  CANCEL_TEXT = "Cancel"
  NO_TEXT = "No"
  OK_TEXT = "OK"
  YES_TEXT = "Yes"
  
  # Strings.
  CANNOT_DELETE_ELEMENT = "This item cannot be deleted."
  CANNOT_EDIT_ELEMENT = "This item cannot be edited."
  CONFIRM = "Confirm"
  EDIT_ERROR = "The following errors occurred:"
  EDIT_SUCCESS = "Your changes were saved successfully."
  EDIT_SUCCESS_WITH_ERRORS = "Your changes were saved with the following errors:"
  EMPTY_STRING = ""
  ERROR_WINDOW_TITLE = "Error"
  FORM_ERROR = "Please provide information in the following fields:"
  INFO_WINDOW_TITLE = "Information"
  NEW_LINE = "\n"
  NEW_TABBED_LINE = "\n    - "
  PROCEED_WITH_ROW_DELETION = (
      "Are you sure you would like to delete the selected row?"
  )
  PROCEED_WITH_ROWS_DELETION = "Are you sure you would like to delete all rows?"
  PROCEED_WITH_SAVING_CHANGES = "Are you sure you would like to proceed?"
  PROCEED_WITHOUT_SAVING_CHANGES = (
      "Would you like to proceed without saving your changes?"
  )
  SUCCESS_WINDOW_TITLE = "Success"
  TABBED_LINE = "    - "
  UNEXPECTED_ERROR = "An unexpected error occurred in {}.\n{}"
  UNEXPECTED_ERROR_CAUSED_BY = (
      "An unexpected error occurred in {}.\n{}\nCaused by: {}"
  )
  WARNING_WINDOW_TITLE = "Warning"
  