Regen docs after keyboard string modularization

...in tuxpaint-docs

docs/ja_JP.UTF-8/FAQ.txt

@@ -4,7 +4,7 @@
          Copyright © 2002-2022 by various contributors; AUTHORS.txt 参照.
                              https://tuxpaint.org/
 
-                                   2022年1月20日
+                                   2022年5月15日
 
      ----------------------------------------------------------------------
 
@@ -450,8 +450,9 @@ Fullscreen Mode Problems
            Linux users - Your X-Window server is probably not set with the
            ability to switch to the desired resolution: 800×600. (or whatever
            resolution you have Tux Paint set to run at.) (This is typically
-           done manually under the X-Window server by pressing [Ctrl] + [Alt]
-           + [Keypad Plus] and [Ctrl] + [Alt] + [Keypad Minus].)
+           done manually under the X-Window server by pressing [Control] +
+           [Alt] + [Keypad Plus (+)] and [Control] + [Alt] + [Keypad Minus
+           (-)].)
 
            For this to work, your monitor must support that resolution, and
            you need to have it listed in your X server configuration.