Can't reproduce here. Even with developer mode enabled, i can't see that entry here.
Me neither at this moment. It's a quite elusive string.
Anyway. When searching the string in Opera installation files (without the final accent), the following matches are displayed:
Searching 98 files for "Emergente de inspecci"
C:\Program Files (x86)\Opera\31.0.1889.99\localization\es-419.pak:
(binary)
C:\Program Files (x86)\Opera\31.0.1889.99\localization\es.pak:
(binary)
2 matches across 2 files
Cheers.