A much better solution is this:
Expound is ready for translation (at least in those parts that are visible to the public, including the button you′re asking about.)
1. Download the program poedit.
1b. … and read a bit more how to use it.
2. Then find the catalog /languages/ under the theme and make a local copy of the file expound.pot
3. Under preferences, instruct poedit to automatically save a mo-file whenever a po-file is saved.
4. Now, in po-edit, create a new “Catalogue from POT file”.
5. In the catalogue properties, indicate language as pl_PL
save the file with the name pl_PL.po
6. Plural settings: If Polish uses the same plurals as in Russian, then you should enter the following under plural forms:
nplurals=3; plural=(n%10==1 && n%100!=11) ? 0 : ((n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20)) ? 1 : 2);
This will create 3 forms of plural aware phrases:
1, 21, 31, 41…
2, 3, 4, 22, 23, 24, 32, 33…
everything else (5-19, 25-30…)
And now you can just make the translation and save it.
For this to work, your wordpress installation needs to be instructed to use Polish. If you installed a Polish version from the start, then that is already done. Otherwise, you may need to edit one line in the file wp-config.php
define ('WPLANG', 'pl_PL');
Keep a copy of your translation. There′s a risk that it will disappear when the theme is updated (or if you need to reinstall the theme.)
You may also want to share your work with others, by sending the po- and mo-files to the themes author, so that he can include Polish in the theme during next update. ??
