1. Select [Tools] > [Server Manager]
2. Click [Bundled Tomcat (5.5.7)]

At this point, the [Server Manager] window has the following three tabs
that have one label.

tab              label
Classes          Classes  (mnemonic key is 'C')
Sources          Sources  (mnemonic key is 'S')
Javadocs         Javadocs (mnemonic key is 'J')

These messages are defined in the following file.

tomcatint/tomcat5/src/org/netbeans/modules/tomcat5/ide/Bundle.properties
TXT_Classes=Classes
TXT_Sources=Sources
TXT_Javadoc=Javadocs
MNE_Classes=C
MNE_Sources=S
MNE_Javadoc=J

However, one message are used as two messages, one is tab's label without
mnemonic key and another is label with mnemonic key.
When the above messages are translated into Japanese, ja messages are as follows
and ja tab's label is displayed with mnemonic key.
Please see the attached snapshots.

TXT_Classes=Japanese_Classes(C)
TXT_Sources=Japanese_Sources(S)
TXT_Javadoc=Javanese_Javadocs(J)

To fix this problem, please add tab's labels without mnemonic key.
For example:

TXT_tab_Classes=Classes
TXT_tab_Sources=Sources
TXT_tab_Javadoc=Javadocs
TXT_Classes=Classes
TXT_Sources=Sources
TXT_Javadoc=Javadocs
MNE_Classes=C
MNE_Sources=S
MNE_Javadoc=J