It's not completely clear what your request is. There are no ce translations of these namespaces, so these fallback to Russian...

$namespaceNames['ru'] = [
	NS_GADGET => 'Гаджет',
	NS_GADGET_TALK => 'Обсуждение_гаджета',
	NS_GADGET_DEFINITION => 'Определение_гаджета',
	NS_GADGET_DEFINITION_TALK => 'Обсуждение_определения_гаджета',
];

So presumably you want those russian translations replacing with

$namespaceNames['ce'] = [
	NS_GADGET_TALK => 'Гаджет_билгаляккхар',
	NS_GADGET_DEFINITION => 'Гаджет_дийцаре',
	NS_GADGET_DEFINITION_TALK => 'Гаджет_билгалякхарах_дийцаре.',
];

Is the NS_GADGET translation of Гаджет ok?

In T265841#6558737, @Reedy wrote:

It's not completely clear what your request is. There are no ce translations of these namespaces, so these fallback to Russian...

$namespaceNames['ru'] = [
	NS_GADGET => 'Гаджет',
	NS_GADGET_TALK => 'Обсуждение_гаджета',
	NS_GADGET_DEFINITION => 'Определение_гаджета',
	NS_GADGET_DEFINITION_TALK => 'Обсуждение_определения_гаджета',
];

So presumably you want those russian translations replacing with

$namespaceNames['ce'] = [
	NS_GADGET_TALK => 'Гаджет_йийцар',
	NS_GADGET_DEFINITION => 'Гаджет_къастор',
	NS_GADGET_DEFINITION_TALK => 'Гаджет_къастор_дийцар',
];

Is the NS_GADGET translation of Гаджет ok?

Yes everything is correct. The gadget will be in both English and Russian

@Umar: Please always read and follow https://meta.wikimedia.org/wiki/Requesting_wiki_configuration_changes . Thanks.

Sorry, I somehow forgot this. I'll do it as soon as possible. However, to be on the safe side, I need to check: is it "билгаляккхар" with two letters к, and "билгалякхарах" with one letter к?

In T265841#8636444, @Amire80 wrote:

Sorry, I somehow forgot this.

FYI, https://phabricator.wikimedia.org/maniphest/query/assigned/ lists your assigned tasks