translate the launcher: load mod string catalogs before it draws (#794)

the launcher runs before Game:load, so #767's Strings hooks had nothing
filling the catalog and a restart could not help - the ordering is the same
every launch. reads lang/strings.lua from enabled mods only, data not the
entry chunk, sandboxed.

plus a plain pixel fallback on the ui faces, or the kana draw as tofu.

libs/flexlove/modules/FontCache.lua

@@ -107,6 +107,11 @@ function FONT_CACHE.get(size, fontPath)
     font = love.graphics.newFont(size)
   end
 
+  -- Per-glyph fallback so a non-Latin UI string is not drawn as tofu.
+  -- pcall'd require: FlexLove is vendored and must still load standalone.
+  local okUi, UiFont = pcall(require, "src.render.UiFont")
+  if okUi and UiFont then UiFont.attach(font, size) end
+
   -- Add to cache with LRU metadata
   FONT_CACHE[cacheKey] = {
     font = font,