The translation file on one line lack

FREE_PAYMENT=" :evil: "

That's normal. By default, we don't want any text for that, but you can always add an override for it if you need to display some text.

The problem was that. There is nothing in the file translation. "FREE_PAYMENT=" no does not exist in translation. If this is not a translation file, it shows "FREE_PAYMENT".

To get rid of it add language files FREE_PAYMENT=" "

In which language file ? Are you using the latest version of the language file ?

after the latest update, in the checkout process, in the payment step
now there is a FREE_PAYMENT next to the name of the payment option

So you need to go to your language file and write: FREE_PAYMENT=" " to make it disappear, as Felix said

The FREE_PAYMENT line is already in all the translation files as far as I can see.

Where is the registration of a plugin or module?
Does not translate into an error message.
"Palun sisesta väärtus lahtrisse name"
("Please enter a value in cell name")
The same is also: username, email and password.

These are the translation strings for the registration:

PASSWORDS_DO_NOT_MATCH="Passwords do not match"
VALID_EMAIL="Please enter a valid e-mail address"
PLEASE_FILL_THE_FIELD="Please fill the %s field"

You can find them in your translation file via the Languages tab of the configuration.

For the fields name, you can change them via the menu Display->Custom fields. If you want to translate the custom fields, you can also do it via the language file, or via falang/joomfish's interface.

It is OK.
The problem is that:
PLEASE_FILL_THE_FIELD="Please fill the %s field"

%s = name
%s = username
%s = email
%s = password

These four words cannot be translated.

These should already be translated in HikaShop, in the translation file:

HIKA_USER_NAME="Nom"
HIKA_USERNAME="Nom d'utilisateur"
HIKA_EMAIL="Email"
HIKA_PASSWORD="Password"
..etc..

It is OK.
The problem is that:
OK
translation problem

Registration

Name *If If a cell is blank, it says:"Please enter a value for the field name"
Username *[/color]If If a cell is blank, it says:"Please enter a value for the field Username"
E-mail *[/color]If If a cell is blank, it says:"Please enter a value for the field E-mail"
Password *[/color]If If a cell is blank, it says:"Please enter a value for the field Password"
Verify Password *[/color]If If a cell is blank, it says:"Please enter a value for the field Password2"

Address information
First name *
Last name *
Company
Address *
City *
Post code *
Telephone
Country *
State *
Fields marked with an asterisk (*) are required.
Register

How to translate "Password2"?

You can add the translation:
PASSWORD2="My text"