Create flag and update label for a conflicted post

[embryoconcepts]

• Create a BOOL flag for a post that has a conflict in the dateModified property between the local and web versions
• Update the status on the PostCard and PostCompact cells to display ‘Version Conflictinerror` coloring, when a post has a version conflict

NOTES:

• Android uses isConflicted, but I felt hasVersionConflict was more precise, and more future-proof (ie, there may be other types of conflicts in the future, and this leaves room for those names
• I opted to only update the local status, ala “Local Changes”, and not the post status, since this is something that is restricted to local - please let me know if I should incorporate it as a proper Post Status, and I can do that

Fixes (in part) #13683

To test:

1. Create a draft while I am online in the app. That’ll create the draft in remote.
2. Go offline
3. Make changes to the post and go back. This will save the changes as local draft
4. Go to web or any other client and make changes to the post.
5. Publish the post.
6. on the app, you should be on the posts list. turn airplane mode off
7. pull to refresh.
8. you should see now the post has a “Conflicted” state.

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[leandroalonso]

Good work here @embryoconcepts.

Left a few suggestions for unit tests and a question about the conflict logic.

[leandroalonso]

Thank you so much for the changes @embryoconcepts!

Almost there!

[leandroalonso]

Just minor changes @embryoconcepts and we would be good to go! o/

[leandroalonso]

@embryoconcepts All good to go. Just one detail:

Can you please remove Localizable.strings? We should not change this file (you can see a warning above about it).