Update NSIS scripts.

src/windows/installer.nsi

@@ -35,7 +35,8 @@ Section $(inst_qbt_req) ;"qBittorrent (required)"
   File /oname=translations\qt_cs.qm "translations\qt_cs.qm"
   File /oname=translations\qt_da.qm "translations\qt_da.qm"
   File /oname=translations\qt_de.qm "translations\qt_de.qm"
-  File /oname=translations\qt_es.qm "translations\qt_es.qm"  
+  File /oname=translations\qt_es.qm "translations\qt_es.qm"
+  File /oname=translations\qt_es.qm "translations\qt_eu.qm"  
   File /oname=translations\qt_fi.qm "translations\qt_fi.qm"
   File /oname=translations\qt_fr.qm "translations\qt_fr.qm"
   File /oname=translations\qt_gl.qm "translations\qt_gl.qm"

src/windows/uninstaller.nsi

@@ -11,6 +11,7 @@
   Delete "$INSTDIR\translations\qt_da.qm"
   Delete "$INSTDIR\translations\qt_de.qm"
   Delete "$INSTDIR\translations\qt_es.qm"
+  Delete "$INSTDIR\translations\qt_eu.qm"
   Delete "$INSTDIR\translations\qt_fa.qm"
   Delete "$INSTDIR\translations\qt_fi.qm"
   Delete "$INSTDIR\translations\qt_fr.qm"