Prepared 0.15.0 release (#915)

* Translated using Weblate (Italian)
* Translated using Weblate (Dutch)
* Translated using Weblate (Swedish)
* Translated using Weblate (English)
* Translated using Weblate (German)
* Translated using Weblate (French)
* Added translation using Weblate (Russian)

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Co-authored-by: giovanni69 <giovanni69@noreply.codeberg.org>
Co-authored-by: Edwin <edwin@noreply.codeberg.org>
Co-authored-by: SA0BIB <sa0bib@noreply.codeberg.org>

Author: 4 people

i18n/de.ts

@@ -58,7 +58,7 @@
             </size>
            </property>
            <property name="toolTip">
-            <string>Enter a repater call-sign.</string>
+            <string>Enter a repeater call-sign.</string>
            </property>
           </widget>
          </item>