I found my fields' labels on 'admin/config/regional/translate/translate' page because they are outputed with t() in _add_existing_field select list.
The user finds field label on 'admin/config/regional/translate/translate' page, translates it and expects that this translation will appear in entity view but it doesn't according to #1157426: Field system uses t() incorrectly and inconsistently.
After all this translated label is set as default label for new instance of existing field which not always useful.

Came from here: http://drupal.stackexchange.com/questions/36065/interface-translation-of...

Files: 
CommentFileSizeAuthor
#8 remove-t-for-label-1672694-8.patch633 bytesjibran
PASSED: [[SimpleTest]]: [MySQL] 39,574 pass(es).
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#3 remove-t-for-label-1672694-3.patch651 bytesJulienD
PASSED: [[SimpleTest]]: [MySQL] 47,854 pass(es).
[ View ]
#1 remove-t-for-label-1672694-1.patch653 bytesDevin Carlson
PASSED: [[SimpleTest]]: [MySQL] 37,262 pass(es).
[ View ]
field_ui-remove-t-for-label.patch633 byteskalabro
FAILED: [[SimpleTest]]: [MySQL] Unable to apply patch field_ui-remove-t-for-label.patch. Unable to apply patch. See the log in the details link for more information.
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Comments

Version:7.x-dev» 8.x-dev
Status:Active» Needs review
Issue tags:+needs backport to D7
StatusFileSize
new653 bytes
PASSED: [[SimpleTest]]: [MySQL] 37,262 pass(es).
[ View ]

Rerolled for Drupal 8.

Issue tags:+Novice

This looks like a good novice issue (check if the old patch still applies, check if any translation issues occur as a result of the change, reroll or update as necessary).

StatusFileSize
new651 bytes
PASSED: [[SimpleTest]]: [MySQL] 47,854 pass(es).
[ View ]

I just regenerated your patch and I didn't find any other occurrences

Issue tags:+D8MI

Status:Needs review» Reviewed & tested by the community

Field labels should be localized in CMI and not through t().

#3: remove-t-for-label-1672694-3.patch queued for re-testing.

Version:8.x-dev» 7.x-dev
Status:Reviewed & tested by the community» Patch (to be ported)

Committed/pushed to 8.x, thanks!

StatusFileSize
new633 bytes
PASSED: [[SimpleTest]]: [MySQL] 39,574 pass(es).
[ View ]

D7 patch

Status:Patch (to be ported)» Needs review

status updated

Status:Needs review» Reviewed & tested by the community

Reviewed and tested. Patch looks fine.

Status:Reviewed & tested by the community» Fixed

Automatically closed -- issue fixed for 2 weeks with no activity.