Hide filenames for media in chat.

[anakin78z]

Implements #6056

Added setting to always show filenames.

🖼️ Screenshots

🏚️ Before	🏡 After	⚙️ Setting

🚧 TODO

• Translate setting text, @string/nc_settings_show_media_filenames_title & @string/nc_settings_show_media_filenames_desc

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not needed
• 🔖 Capability is checked or not needed
• 🔙 Backport requests are created or not needed: /backport to stable-xx.x
• 📅 Milestone is set
• 🌸 PR title is meaningful (if it should be in the changelog: is it meaningful to users?)

[anakin78z]

I don't know how translations work for this app. Feel free to assign & resolve as needed.

[AndyScherzinger]

Translations happen via transifex, so for development it is is main strings.xml only. Anything else gets overwritten daily.

Screenshots look nice. @nimishavijay for feedback especially regarding the config option, given we usually try to avoid them.

[anakin78z]

My reason for adding a setting for it is that it can be useful for certain work scenarios. For example someone posting multiple versions of an image, with the version number in the filename. Yes, you can get it by clicking on the image, but it's sometimes truncated there.