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.

src/import/LauncherView.lua

@@ -329,7 +329,9 @@ local function mfont(size)
   size = math.max(8, math.floor(size + 0.5))
   local f = measureFonts[size]
   if not f then
-    f = love.graphics.newFont(size)
+    -- same fallback the rendering faces get (FlexLove FontCache), or the
+    -- launcher measures Latin widths for text it draws with kana
+    f = require("src.render.UiFont").attach(love.graphics.newFont(size), size)
     measureFonts[size] = f
   end
   return f