In my optinion it's much clearer to list the possible values after the basic explanation.
It could be after the sentence, but it might be somewhat improper then, I'm not sure. And shouldn't use brackets for it, but ( ) instead, as far as I know... http://www.thepunctuationguide.com/parentheses.html
example:
- <item name="wcf.acp.group.option.user.board.floodControlTime.description"><![CDATA[Minimum period between creation of two posts. [time in seconds]]]></item>
+ <item name="wcf.acp.group.option.user.board.floodControlTime.description"><![CDATA[Minimum period between creation of two posts. (time in seconds)]]></item>
or
- <item name="wcf.acp.group.option.user.board.floodControlTime.description"><![CDATA[Minimum period between creation of two posts. [time in seconds]]]></item>
+ <item name="wcf.acp.group.option.user.board.floodControlTime.description"><![CDATA[Minimum period between creation of two posts. (Time in Seconds)]]></item>
I'm not sure, but "time in seconds" appears to be wrong, as the "T" and "S" should be uppercase, but then it appears as a start of a new sentence itself, which is left open and no trailing periods, or whatever. If the letters remain lowercase, it's also "off" and don't appear right...
Please keep in mind to retain an consistent structure independent from the used language.
It would be consistent after they were all modified, I didn't get that far yet. Besides, there're some places currently where they are inconsistent for both languages, using () in one or two places, but then the rest use [] which isn't technically right at all. Please remember, this is for the English files, and I'm not on your/German side proposing these changes to your language files.
If I were over there proposing changes, I'd get holy hell for it. But when we want to correct grammar for English-related stuff, the Germans come over here whining about everything under the sun, that shouldn't be changed for suiting the English folk. As if we're supposed to just live with wonky, funny-sounding phrases, and improper grammar and be happy.
By the time I get done editing things to make you happy, we're back to square one again with nothing accomplished to improve English grammar etc.