Language is not key to friendship no. The key to friendship might be trust and understanding. If you can understand your friend and they understand you and you trust them and they trust you, your friendship will probably last. There are all sorts of other ideas of what the key to friendship is so don't just take my advice. You need to decide what you value in a friendship and decide what your key to friendship is.
The language of friendship is how you behave; the language of friendship is how you treat people, not words or what they mean.
Friendship: ДРУЖБАPronunciation: Druzhba (uas oo in moose; zh as s in measure).
Freundschaft
A language barrier.
A friendship can be a language when the two or more friends just "Know" what the other(s) are thinking of of about to say.... Finishing each other's sentences...
because love is the key to friendship and friendship make lifetime romance
A Key Into the Language of America was created in 1643.
You say "Flyship"
language of individuals and key people
I think the theme of this book is Friendship, Power and Language.
Friendship should be based on respect, honesty, and trust. Those are the key roles of relationship.
The most common poetic language is English. It sounds nice when poems are expressed in English.