[TYPO3-mvc] localization in 6.2.0

[Thomas Mammitzsch]

Hi list,

a few questions about the xlf localization, as i worked only with the 
extbase 2.3 before and are now a bit confused how it works.

1. I didn't get my changed labels shown in frontend until i deleted 
everything in typo3temp/Cache/Data/l10n. Deleting cache via backend 
didn't do anything for localisation. Is this the way to go?

2. If i create a f.e. de.locallang.xlf, i have to have the subnodes 
<source> and <target> in the node <trans-unit>. If i now change the 
<source> in locallang.xlf, do i need to change the source in 
de.locallang.xlf too? Or can i have <target> nodes also in locallang.xlf 
(english) so i change the <target> node instead of the source node?
To be more explicit: I don't want to update all <source> nodes in all 
*.locallang.xlf files if the english label should change.

regards, Thomas