[openstreetmap/openstreetmap-website] Added indicator message preview is empty. (PR #4894)

[Nenad Vujicic]

This PR addresses "Indicate if the message preview is empty" issue mentioned in the #3748

In app/controllers/site_controller.rb added replacing empty text with "Nothing to preview." when rendering preview. Also, added placeholders "Add subject" and "Add your message here" to forms when creating diary entries, comments and sending messages to another users. Also, updated translation files.

![image](https://github.com/openstreetmap/openstreetmap-website/assets/25298521/db30d77c-4501-447f-a154-7ab8b774ad36)
![image](https://github.com/openstreetmap/openstreetmap-website/assets/25298521/b37df509-0289-436e-bc43-f234d74dfab3)
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/4894

-- Commit Summary --

  * Added indicator message preview is empty.

-- File Changes --

    M app/controllers/site_controller.rb (3)
    M app/views/diary_entries/_form.html.erb (4)
    M app/views/diary_entries/show.html.erb (2)
    M app/views/messages/new.html.erb (4)
    M config/locales/en.yml (6)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/4894.patch
https://github.com/openstreetmap/openstreetmap-website/pull/4894.diff

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