Update CHANGES file. This commit marks Enigma 1.21!

Changes in Version 1.21
=======================

User-Visible changes
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    - New translations: Croatian, Czech, Danish, Scottish-Gaelic, and Slovak
    - updated remaining translations
    - fixed many English typos
    - Russian reference manual
    - rollover for options and rating buttons
    - 51 new Enigma levels (now a total of 984 main-pack levels, plus 21 tutorials)

Internal changes
----------------

    - further rewrites of old-API levels to new API (only 212 old-API left)
    - many bug fixes

Adapt volume of some music files.

Branch 1.0:

- Mac update of icon
Note:
- this is the final all architecture 1.01 release

Release 1.00

1.00 beta - released

- *.po updated

escape strings before writing them to the configuration file