Add Slovenian language for frontend

See #303

src-ui/angular.json

@@ -30,6 +30,7 @@
 					"pt-PT": "src/locale/messages.pt_PT.xlf",
 					"ro-RO": "src/locale/messages.ro_RO.xlf",
 					"ru-RU": "src/locale/messages.ru_RU.xlf",
+					"sl-SI": "src/locale/messages.sl_SI.xlf",
 					"sv-SE": "src/locale/messages.sv_SE.xlf"
         }
 			},

src-ui/src/app/app.module.ts

@@ -80,9 +80,10 @@ import localeLb from '@angular/common/locales/lb'
 import localeNl from '@angular/common/locales/nl'
 import localePl from '@angular/common/locales/pl'
 import localePt from '@angular/common/locales/pt'
-import localeSv from '@angular/common/locales/sv'
 import localeRo from '@angular/common/locales/ro'
 import localeRu from '@angular/common/locales/ru'
+import localeSl from '@angular/common/locales/sl'
+import localeSv from '@angular/common/locales/sv'
 
 registerLocaleData(localeCs)
 registerLocaleData(localeDa)
@@ -98,6 +99,7 @@ registerLocaleData(localePt, 'pt-BR')
 registerLocaleData(localePt, 'pt-PT')
 registerLocaleData(localeRo)
 registerLocaleData(localeRu)
+registerLocaleData(localeSl)
 registerLocaleData(localeSv)
 
 @NgModule({

src-ui/src/app/services/settings.service.ts

@@ -252,6 +252,12 @@ export class SettingsService {
         englishName: 'Russian',
         dateInputFormat: 'dd.mm.yyyy',
       },
+      {
+        code: 'sl-si',
+        name: $localize`Slovenian`,
+        englishName: 'Slovenian',
+        dateInputFormat: 'dd.mm.yyyy',
+      },
       {
         code: 'sv-se',
         name: $localize`Swedish`,

src/paperless/settings.py

@@ -313,6 +313,7 @@ LANGUAGES = [
     ("pt-pt", _("Portuguese")),
     ("ro-ro", _("Romanian")),
     ("ru-ru", _("Russian")),
+    ("sl-si", _("Slovenian")),
     ("sv-se", _("Swedish")),
 ]