Pull request: all: use "ClientID" consistently

Closes #4242.
Updates #4244.

Squashed commit of the following:

commit 3a2296a7a70006cf6777e54ce1e2fc3559aec5be
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Feb 9 21:23:43 2022 +0300

    client: imp more

commit 3aacc8696ac694ff459fd33ba7beeeabd2569a55
Merge: b28a120f 2a5b5f19
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Feb 9 21:21:59 2022 +0300

    Merge branch 'master' into 4244-imp-i18n

commit b28a120fe9aa68507b173717059b7b259097d6a4
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Feb 9 14:49:49 2022 +0300

    client: imp texts more

commit c1fa6ca336f2d5bdcc67836f348be4843a0a8f79
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Feb 8 21:12:15 2022 +0300

    all: use "ClientID" consistently

client/src/components/Settings/Encryption/Form.js

@@ -201,8 +201,6 @@ let Form = (props) => {
                     <div className="form__group form__group--settings">
                         <label className="form__label" htmlFor="port_dns_over_quic">
                             <Trans>encryption_doq</Trans>
-                            &nbsp;
-                            <span className="text-lowercase">(<Trans>experimental</Trans>)</span>
                         </label>
                         <Field
                                 id="port_dns_over_quic"