dialekt

/dialekt/

Cases

SingularPluralWhen to use it
nominativedialektthe dialectdialektlethe dialectsthe plain dictionary form — the doer of the sentence
genitivedialektnithe dialect'sdialektlenithe dialects'the owner — whose it is
accusativedialektnithe dialect (as the object)dialektlenithe dialects (as the object)a specific, known object — whom or what
dativedialektgeto the dialectdialektlegeto the dialectsdirection or recipient — to where, to whom
locativedialektdeat / in the dialectdialektledeat / in the dialectswhere it is; also having — mende bar, "I have it"
ablativedialektdenfrom the dialectdialektledenfrom the dialectswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
mydialektimmy dialectdialektlerimmy dialects
yourdialektingyour dialectdialektleringyour dialects
his / herdialektihis / her dialectdialektlerihis / her dialects
ourdialektibizour dialectdialektleribizour dialects
you all'sdialektigizyou all's dialectdialektlerigizyou all's dialects
theirdialektleritheir dialectdialektleritheir dialects

The overlap in the last rows is real, not a mistake: dialektleri can mean "his / her dialects", "their dialect", or "their dialects" — context decides.