Try this.

To sum, specify an additional translation file under the core module's translation XPath and place your overriding CSV pairs in there.

<frontend>
    <translate>
        <modules>
            <Mage_Sales>
                <files>
                    <mr_storms_wicked_translations>Mage_Sales_Custom.csv</mr_storms_wicked_translations>
                </files>
            </Mage_Sales>
        </modules>
    </translate>
</frontend>

Try this.

To sum, specify an additional translation file under the core module's translation XPath and place your overriding CSV pairs in there.

<frontend>
    <translate>
        <modules>
            <Mage_Sales>
                <files>
                    <mr_storms_wicked_translations>Mage_Sales_Custom.csv</mr_storms_wicked_translations>
                </files>
            </Mage_Sales>
        </modules>
    </translate>
</frontend>

Try this.

To sum, specify an additional translation file under the core module's translation XPath and place your overriding CSV pairs in there.

<frontend>
    <translate>
        <modules>
            <Mage_Sales>
                <files>
                    <mr_storms_wicked_translations>Mage_Sales_Custom.csv</mr_storms_wicked_translations>
                </files>
            </Mage_Sales>
        </modules>
</frontend>

Try this.

To sum, specify an additional translation file under the core module's translation XPath and place your overriding CSV pairs in there.

<frontend>
    <translate>
        <modules>
            <Mage_Sales>
                <files>
                    <mr_storms_wicked_translations>Mage_Sales_Custom.csv</mr_storms_wicked_translations>
                </files>
            </Mage_Sales>
        </modules>
    </translate>
</frontend>