Extension to use for the Basis of integrating SilverStripe Block with Translatable. Add this extension to your page type or copy the onTranslatableCreate function to your page class.

TranslatableBlockPage.php

<?php
	
class TranslatableBlockPage extends DataExtension {
	
	/**
	* Simple support for Translatable, when a page is translated, copy all content blocks and relate to translated page
	* Apply to Pages
	*/
	public function onTranslatableCreate() {
		
		$translatedPage = $this->owner;
		// Getting the parent translation
    	/* Get Locale from $_POST to ensure you're copying translation that triggered createTranslation */
    	$postLang = Controller::curr()->request->postVar('Locale');
    	$originalPage = $this->owner->getTranslation($postLang);
	
		//This is Key, set local to the source to ensure you're duplicating the right set. By default Locale is transalted page not the source. 
    	Translatable::set_current_locale($postLang);
    
		if($originalPage->Blocks()->count()) {
			foreach($originalPage->Blocks() as $originalBlock) {
				$block = $originalBlock->createTranslation($translatedPage->Locale);
				$translatedPage->Blocks()->add(
        	            $block,
                	    array('Sort' => $originalBlock->Sort, 'BlockArea' => $originalBlock->BlockArea)
                );
			}
		}
	
		if($originalPage->DisabledBlocks()->count()) {
			foreach($originalPage->DisabledBlocks() as $originalBlock) {
				$block = $originalBlock->createTranslation($translatedPage->Locale);
                	$translatedPage->Blocks()->add(
                    	$block,
                    	array('Sort' => $originalBlock->Sort, 'BlockArea' => $originalBlock->BlockArea)
                	);
			}
		}
		//Set Locale back to transalted page.
     	Translatable::set_current_locale($translatedPage->Locale);
	}	
}