How To Forward Port an Existing Language Pack

Question

For some languages (en_UK, fi_FI and others) there are outdated language packs available on Magento connect (in these cases based on Magento 1.6).

We are using a recent Enterprise Edition (1.13).

Basically we want to generate a new CSV files which contains all the texts of our current Magento version (i.e. from the en_US folder of Magento Core) and pre-fill / merge the already existing translations (from the outdated non-US-English language pack), so that a translator can fill the missing fields.

Are there tools for that / did anybody do this before?

Remark: I did some edits for clarification in the text, so old comments might not apply anymore.

Answer 1

This is not a solution. It's more of an idea. You can identify the texts that are 'translatable' with a regex. See the answers here, then just parse the existing CSV files (that should be easy) and merge the results.
If you use this regex '/helper\(\\\'([a-z_]+)\\\'\)-\>__\([\s]*([\'|\\\"])(.*?[^\\\\])\\2.*?\)/' it should identify the module names in texts like Mage::helper('some_helper')->__('Some text').
The hard part in identifying the module is for texts like $this->__('Some text') but you should be able to get the module from the file path. Use this regex for that '/\$this-\>__\([\s]*([\'|\\\"])(.*?[^\\\\])\\1.*?\)/'.
For xml files it should be easy. Just parse them and look for the translate attribute.