Add contents of the assets/lang submodule to the main repo.

assets/lang/README.md

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+# lang
+
+PPSSPP language ini repository
+
+# Thanks for your interest in translating PPSSPP!
+
+* Simply copy *en_US.ini* file to a new ini file with your language code, or use it to update an existing file with that name.
+* To see a list of codes, view [this](http://stackoverflow.com/questions/3191664/list-of-all-locales-and-their-short-codes) page.
+
+# Please note, while translating:
+* Ampersands `&` on the *RIGHT* side of an equals sign denote an underlined keyboard hotkey.
+* The hotkeys are only supported currently in the *DesktopUI* section, however.
+* Example: `&File`. This will make it so when you press ALT + F on Windows, it'll open the File menu.
+
+# Tools
+
+* To remove a translation, use the following (where KeyWord is the key):
+
+    find . -type f -print0 | xargs -0 sed -i /^KeyWord/d
+
+* To change a translation key, use something like this:
+
+    find . -type f -print0 | xargs -0 sed -i /^Key/NewKey
+
+* Before you commit, use git diff to check that you don't delete too much
+  or some unrelated key with the same prefix.
+
+### Happy translating!