I've changed the adjective in line 281 into a verb, due to the "natural flow" of the sentence.
Furthermore I have a question concerning your chosen noun in line 278, namely "weight factor". What do you want to state with it, respectively, what kind of context are we talking about?
<item name="wcf.acp.option.cache_source_memcached_host.description"><![CDATA[One server per line, you can additionally specify a weight factor to allow load balancing, for example “localhost:11211:67” or “10.0.13.37:31337:33”.]]></item>
<item name="wcf.acp.option.cache_source_type"><![CDATA[Caching Method]]></item>
<item name="wcf.acp.option.cache_source_type.apc"><![CDATA[Alternative PHP Cache (experimental)]]></item>
- <item name="wcf.acp.option.cache_source_type.description"><![CDATA[Caching methods different from “Filesystem” require special extensions or services running on your machine.]]></item>
+ <item name="wcf.acp.option.cache_source_type.description"><![CDATA[Caching methods differing from “Filesystem” require special extensions or services running on your machine.]]></item>
<item name="wcf.acp.option.cache_source_type.disk"><![CDATA[Filesystem (default)]]></item>
<item name="wcf.acp.option.cache_source_type.memcached"><![CDATA[Memcached]]></item>
<item name="wcf.acp.option.cache_source_type.no"><![CDATA[Disable caching (not recommended)]]></item>