Add Swedish translation

Thanks to Jan-Erik!

See issue #2621.

src/src.pro

@@ -197,7 +197,8 @@ TRANSLATIONS += \
     translations/sqlb_uk_UA.ts \
     translations/sqlb_it.ts \
     translations/sqlb_ja.ts \
-    translations/sqlb_nl.ts
+    translations/sqlb_nl.ts \
+    translations/sqlb_sv.ts
 
 # SQLite / SQLCipher switch pieces
 CONFIG(sqlcipher) {

src/translations/flags/flags.qrc

@@ -19,5 +19,6 @@
         <file alias="pl_PL">pl.png</file>
         <file alias="ja_JP">jp.png</file>
         <file alias="nl_NL">nl.png</file>
+        <file alias="sv_SE">sv.png</file>
     </qresource>
 </RCC>

src/translations/translations.qrc

@@ -17,5 +17,6 @@
         <file alias="sqlb_it">sqlb_it.qm</file>
         <file alias="sqlb_ja">sqlb_ja.qm</file>
         <file alias="sqlb_nl">sqlb_nl.qm</file>
+        <file>sqlb_sv.qm</file>
     </qresource>
 </RCC>