chore(l10n): update Danish translations

Currently translated at 100.0% (129 of 129 strings)

Translation: Fossify/Calculator
Translate-URL: https://hosted.weblate.org/projects/fossify/calculator/da/
Via: Weblate

Author: lianergoist

app/src/main/res/values-da/strings.xml

@@ -125,7 +125,7 @@
     <string name="unit_energy_kilowatt_hour">Kilowatt-time</string>
     <string name="unit_energy_megawatt_hour">Megawatt-time</string>
     <string name="unit_energy_electronvolt">Elektronvolt</string>
-    <string name="unit_energy_btu">British thermal unit</string>
+    <string name="unit_energy_btu">Britisk termisk enhed</string>
     <string name="unit_energy_therm">Therm</string>
     <string name="unit_energy_foot_pound">Fod-pund</string>
     <string name="unit_energy_erg">Erg</string>