Keeping translations when moving source strings

Question

I have a single translator.cpp source file containing a lot of strings. These have been been translated to various languages using Qt Linguist. Now I want to split the single file into multiple files:

Old structure:

class Translator
{
    QString str1 = tr("");
    QString str2 = tr("");
    QString str3 = tr("");
};

New structure:

class Translator1
{
    QString str1 = tr("");
};

class Translator2
{
    QString str2 = tr("");
};

class Translator3
{
    QString str3 = tr("");
};

After splitting the translations are lost. What is the fastest way to split the class while keeping the existing translations?

Regards,