With attempt of rename translation item of translatable page => leed to internal db error.
As example, try rename of https://meta.wikimedia.org/wiki/Special:MovePage/Translations:Changing_username/1/qqq
I seen text:
```
Internall error
[73684b41] 2015-01-17 01:24:23: Fatal exception of type MWException
```
And next fragment of source code over page content:
```
array(3) { ["user"]=> string(7) "Kaganer" ["flags"]=> int(0) ["summary"]=> string(10) "by content" } object(Title)#16462 (32) { ["mTextform"]=> string(21) "Changing username/qqq" ["mUrlform"]=> string(21) "Changing_username/qqq" ["mDbkeyform"]=> string(21) "Changing_username/qqq" ["mUserCaseDBKey":protected]=> NULL ["mNamespace"]=> int(0) ["mInterwiki"]=> string(0) "" ["mLocalInterwiki":"Title":private]=> bool(false) ["mFragment"]=> string(0) "" ["mArticleID"]=> int(-1) ["mLatestID":protected]=> bool(false) ["mContentModel"]=> bool(false) ["mEstimateRevisions":"Title":private]=> NULL ["mRestrictions"]=> array(0) { } ["mOldRestrictions":protected]=> bool(false) ["mCascadeRestriction"]=> NULL ["mCascadingRestrictions"]=> NULL ["mRestrictionsExpiry":protected]=> array(0) { } ["mHasCascadingRestrictions":protected]=> NULL ["mCascadeSources"]=> NULL ["mRestrictionsLoaded"]=> bool(false) ["mPrefixedText":protected]=> string(21) "Changing username/qqq" ["mTitleProtection"]=> NULL ["mDefaultNamespace"]=> int(0) ["mWatched":protected]=> NULL ["mLength":protected]=> int(-1) ["mRedirect"]=> NULL ["mNotificationTimestamp":"Title":private]=> array(0) { } ["mHasSubpages":"Title":private]=> NULL ["mPageLanguage":"Title":private]=> bool(false) ["mDbPageLanguage":"Title":private]=> NULL ["mTitleValue":"Title":private]=> NULL ["mIsBigDeletion":"Title":private]=> NULL }
```
NB: although error, renaming was succesful twice (after two attempts): See https://meta.wikimedia.org/w/index.php?title=Changing_username/ru2&action=history This bad situation!