VVVVVV/desktop_version/lang/ja/meta.xml

<?xml version="1.0" encoding="UTF-8"?>
<langmeta>
    <active>1</active>

    <!-- should be lowercase because menu style, and should be in the language itself -->
    <nativename>日本語</nativename>

    <!-- English translation by X -->
    <credit>初版翻訳: Nicalis, Inc.
追加翻訳/校正: KabanFriends</credit>

    <!-- On the language screen, hard limit 40 8x8 characters. Space/Z/V sets this as the language -->
    <action_hint>スペース, Z または V を押して決定</action_hint>

    <!-- Same as above, but for a gamepad button (hard limit 40 8x8 characters) -->
    <gamepad_hint>{button} を押して決定</gamepad_hint>

    <!-- Enable automatic word wrapping instead of having to manually insert newlines -->
    <autowordwrap>0</autowordwrap>

    <!-- Enable automatic full-caps display of selected menu options ([SELECTED] not selected) -->
    <toupper>0</toupper>

    <!-- When automatically uppercasing, map i to İ (for Turkish) -->
    <toupper_i_dot>0</toupper_i_dot>

    <!-- When automatically uppercasing, allow ~ to be used to stop the next letter from being uppercased (for Irish) -->
    <toupper_lower_escape_char>0</toupper_lower_escape_char>

    <!-- Enable for RTL languages like Arabic or Hebrew -->
    <rtl>0</rtl>

    <!-- The indication that a certain menu option or button is selected -->
    <menu_select>[ {label} ]</menu_select>
    <menu_select_tight>[{label}]</menu_select_tight>

    <!-- The filename of the font to use. For example, "font_cn" means font_cn.png and font_cn.fontmeta. -->
    <font>font_ja</font>
</langmeta>