or elementary school teacher (EN-US)

See discussion entry

It seems like the context already explains the term. I suggest "multifunctional teacher", which has a myriad of possibilities, for example:

"The organization of research activity (training a ** multifunctional teacher ** for the contemporary school assumes the inclusion in the educational program of different areas and types and the implementation of individual plans from which the student can choose)."- http://www.analefefs.ro/anale-fefs/2013/s1/pe-autori/64.pdf

"The ** multifunctional teacher ** serves students with all types of disabilities – visual, hearing, mental, physical etc." - https://www.academia.edu/34425137/Integrated_and_Inclusive_E...

"The deisre for a ** multifunctional teacher ** supply and demand study (one that identifies shortage areas and also aids in planning, policy development, and evaluation)..." - https://files.eric.ed.gov/fulltext/ED506631.pdf

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Note added at 1 hr (2019-07-10 13:47:37 GMT)
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polivante: multifunctional, multivalent
https://context.reverso.net/translation/portuguese-english/p...

General Subjects Teacher

Or 'generalist teacher' if the context does not allow for 'generalist'.

Alberta, CA
"Probationary Full-Time Grades 1-2 Generalist Teacher - Rycroft School"
http://www.pwsd76.ab.ca/employment/Pages/201505-110.aspx#.XS...

New York State
In the case of any of the "Generalist" certificates (Early Childhood Education Birth- Grade 2, Childhood Education Grades 1-6, Generalist in Middle Childhood Education Grades 5-9, Students with Disabilities Birth-Grade 2, Students with Disabilities Grades 1-6 and Students with Disabilities Generalist Grades 5-9), the master's degree may be in any of the Liberal Arts & Sciences.
http://www.highered.nysed.gov/tcert/certificate/relatedmaste...

Texas
Career Opportunities
After successful completion of the degree and passing scores on the required certification exams, graduates can apply for 4-8 Generalist teacher certification. The 4-8 Generalist certification makes you eligible to teach grades 4th through 8th in Texas, as the teacher of record for all core subjects. Any teacher who holds an initial valid Texas classroom teaching certificate and a bachelor's degree can later add additional classroom certification areas by completing the appropriate examination(s).
https://www.education.txstate.edu/advising/Degree-Planning/M...



The best answer may depend somewhat on the readership of the translation.