Merge branch 'polish' into shigusegubu

* polish:
  added option for logo in navbar to follow color scheme of the rest of the site also fixed potential mess-up between api/static configs
  i18n: make "plain text" translatable
  add the ability to select a post's content type

static/config.json

@@ -3,6 +3,8 @@
   "theme": "sigsegv",
   "background": "/static/sigsegv_s.png",
   "logo": "/static/logo.svg",
+  "logoMask": true,
+  "logoMargin": ".1em",
   "redirectRootNoLogin": "/main/all",
   "redirectRootLogin": "/main/friends",
   "chatDisabled": true,