feat: load local directories for spellchecking (#6730)

Reviewed-by: pajlada <rasmus.karlsson+github@pajlada.com>

src/widgets/settingspages/ExternalToolsPage.cpp

@@ -248,9 +248,8 @@ void ExternalToolsPage::initLayout(GeneralPageView &layout)
             "dictionaries in " %
             formatRichNamedLink(getApp()->getPaths().dictionariesDirectory,
                                 getApp()->getPaths().dictionariesDirectory) %
-            u". The file index.aff has to contain the affixes and "
-            u"index.dic "
-            u"must contain the dictionary (subject to change).");
+            u". Dictionaries are pairs of .aff (affixes) and .dic (dictionary) "
+            u"files.");
 
         SettingWidget::checkbox("Check spelling by default",
                                 s.enableSpellChecking)
@@ -268,14 +267,13 @@ void ExternalToolsPage::initLayout(GeneralPageView &layout)
         std::vector<std::pair<QString, QVariant>> dictList{{"None", ""}};
 
         std::ranges::transform(
-            getApp()->getSpellChecker()->getSystemDictionaries(),
+            getApp()->getSpellChecker()->getAvailableDictionaries(),
             std::back_inserter(dictList), toItem);
 
         if (dictList.size() > 1)
         {
-            SettingWidget::dropdown(
-                "Fallback spellchecking dictionary (requires restart)",
-                s.spellCheckingFallback, dictList)
+            SettingWidget::dropdown("Default dictionary (requires restart)",
+                                    s.spellCheckingDefaultDictionary, dictList)
                 ->addTo(layout);
         }
     }