An easy way is to go to the language overrides in the administrator console and check for the 'Contact details' value. It will then give you the key to change (you can do a search when you create a new language override).
To save you some time, and for the other tabs, override the keys:
All files related to front output are located in language directories:
You won't find any component file under your language since the component is not translated into it at this time.
Look for the component files under /language/en-GB/en-GB.com_trombinoscopeextended...
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