gentoo linux, locale:
LANG=ru_RU.UTF-8
LC_CTYPE="ru_RU.UTF-8"
LC_NUMERIC="ru_RU.UTF-8"
LC_TIME="ru_RU.UTF-8"
LC_COLLATE="ru_RU.UTF-8"
LC_MONETARY="ru_RU.UTF-8"
LC_MESSAGES=ru_RU.UTF-8
LC_PAPER="ru_RU.UTF-8"
LC_NAME="ru_RU.UTF-8"
LC_ADDRESS="ru_RU.UTF-8"
LC_TELEPHONE="ru_RU.UTF-8"
LC_MEASUREMENT="ru_RU.UTF-8"
LC_IDENTIFICATION="ru_RU.UTF-8"
LC_ALL=

List of commands:
1) pem рыба 10
2) pem конфеты 20
3) pem -s

Result:
        -----------------------------------------------------------------
|   Date   |    Description               |  Earned  |   Spent  |
-----------------------------------------------------------------
|ноя-21 17 |рыба                    |      0.00|     10.00|
|          |конфеты                       |      0.00|     20.00|
-----------------------------------------------------------------
|ноя-21 17 |Вторник (Total)               |      0.00|     30.00|
-----------------------------------------------------------------
|          |Balance                       |               -30.00|
-----------------------------------------------------------------
|          |Average expense/day           |                 1.00|
-----------------------------------------------------------------

рыба - is рыба in ISO.