fix: Finnish grammar

[tlindi]

Updates #2228

[tlindi]

Unfor test fails and fixing it is above my skill level. on my machine make checkbundle passes
...

diff -q lnbits/static/bundle.min.js lnbits/static/bundle.min.js.old || exit 1
diff -q lnbits/static/bundle.min.css lnbits/static/bundle.min.css.old || exit 1
Bundle is OK
rm lnbits/static/bundle.min.js.old
rm lnbits/static/bundle.min.css.old

[prusnak]

Unfor test fails and fixing it is above my skill level. on my machine make checkbundle passes

You were not on the latest dev (your dev was older than our dev).

I rebased on top of our dev and pushed to your branch.

[tlindi]

I was close to solve the issue myself - maybe next time ;-)

Thank you 🙏

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (59968e3) 59.20% compared to head (c9f29e3) 59.23%.
Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2241      +/-   ##
==========================================
+ Coverage   59.20%   59.23%   +0.02%     
==========================================
  Files          60       60              
  Lines        9021     8992      -29     
==========================================
- Hits         5341     5326      -15     
+ Misses       3680     3666      -14     

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