feat(l10n): add Japanese translation

Also sort list of languages ~alphabetically.

Translation thanks to @verycrypt

Closes #3223

res.qrc

@@ -53,6 +53,7 @@
         <file>translations/hr.qm</file>
         <file>translations/hu.qm</file>
         <file>translations/it.qm</file>
+        <file>translations/ja.qm</file>
         <file>translations/nl.qm</file>
         <file>translations/no_nb.qm</file>
         <file>translations/lt.qm</file>

src/widget/form/settings/generalform.cpp

@@ -51,6 +51,7 @@ static QStringList locales = {"bg",
                               "it",
                               "lt",
                               "nl",
+                              "ja",
                               "no_nb",
                               "pl",
                               "pt",
@@ -75,6 +76,7 @@ static QStringList langs = {"Български",
                             "Italiano",
                             "Lietuvių",
                             "Nederlands",
+                            "日本語",
                             "Norsk Bokmål",
                             "Polski",
                             "Português",

translations/i18n.pri

@@ -1,28 +1,30 @@
 # For autocompiling qm-files.
 
-TRANSLATIONS = translations/es.ts \
-               translations/cs.ts \
+TRANSLATIONS = \
+    translations/ar.ts \
     translations/bg.ts \
+    translations/cs.ts \
     translations/de.ts \
     translations/el.ts \
+    translations/es.ts \
     translations/et.ts \
     translations/fi.ts \
     translations/fr.ts \
     translations/hr.ts \
     translations/hu.ts \
     translations/it.ts \
+    translations/ja.ts \
     translations/nl.ts \
     translations/no_nb.ts \
     translations/lt.ts \
     translations/pl.ts \
+    translations/pt.ts \
     translations/ru.ts \
     translations/sl.ts \
     translations/sv.ts \
     translations/tr.ts \
     translations/uk.ts \
-               translations/zh.ts \
-               translations/ar.ts \
-               translations/pt.ts
+    translations/zh.ts
 
 #rules to generate ts
 isEmpty(QMAKE_LUPDATE) {